专四单选练习.doc

Exercises1. People _ space for many years by studying light through their telescope.a. explored b. are exploringc. have been exploring d. will explore2. I _ my letter by the time you come back.a. have finished b. shall finishc. shall have finished d. shall be finishing3. Engels said that what Darwin _ for biology was as great as what Marx _ for history.a. had donehad done b. has done has donec. did did d. does does4. The rest of the evening _ singing and dancing.a. has given up to b. will give up toc. will be given up to d. are given up tp5. _, her heart was beating faster and faster.a. Listening to the coming footstepsb. As she listened to the coming footstepsc. When listening to the coming footstepsd. To the coming footsteps as she listened6. They are said _ a simple method for producing plastics.a. to have found b. findingc. will find d. to be finding7. He was told that after he graduated he _ by a company.a. would be employed b. would get employedc. would be employing d. would employ8. Since computers were invented, it _ that they are indispensable for scientific research.a. was thought b. has been thoughtc. had been thought d. has thought9. If you _ TV every night, of course your eyes will ache.a. sit and watch b. will sit and watchc. are to sit and watch d. sat and watched10. I _ my breakfast when the morning post came.a. had b. had been having c. was having d. have been having11. If _ to speak, he has no problem expressing himself.a. asking b. asked c. ask d. to be asked12. What do you think we shall do if it _ on the day fixed for the sports meet?a. will rain b. rain c. rains d. is raining13. It was not until she had arrived home _ remembered her appointment with the doctor.a. when she b. that she c. and she d. than she14. _ at the moment, Ill go to the shop.a. For it doesnt rain b. For it isnt rainingc. As it doesnt rain d. As it isnt raining15. We had lived in this house for three years _ my father decided to have us move to a new neighborhood.a. while b. since c. before d. after16. When we said goodbye, I thought it was forever. But we _ again, many years later, under very strange circumstances.a. were about to meet b. were to meetc. were meeting d. had met17. When she phoned I didnt have much time to talk, because I _ for France in tow hours.a. left b. would have left c. had left d. was leaving18. Before the first non-stop flight was made in 1949, it _ necessary for all planes to land for refueling.a. would be b. has been c. had been d. would have been 19. Sir Denis, who is 78, has made it known that much of his collection _ to the local museum.a. is left b. had been left c. is being left d. is to be left20. There was a knock at the door. It was the second time someone _ me that evening.a. interrupted b. had interrupted c. was interrupting d. would interrupt21. Dont telephone me after eight. _ a dinner party.a. Weve had b. Were to have c. Well be having d. Were having22. Well probably drive faster than _, so well get there first and buy the tickets.a. youre going to do b. youve donec. youll be doing d. you do23. The newspaper finally ceased publication since its circulation _ steadily over a period of years.a. had dropped b. has droppedc. dropped d. was dropping24. Many artists predict that this brilliant young actor _ to be a shining star.a. destines b. will be destined c. is destinedd. has been destined25. Thats a nice watch. I wish I _ one like it.a. have b. had c. have had d. can have26. I am not used _ to like that.a. to being spoken b. to speakc. being spoken d. to speaking27. No sooner had we reached the top of the hill _ we all sat down to rest.a. than b. then c. when d. until28. I havent seen Mary these past few days; Im afraid she _ herself for some time.a. hasnt been feeling b. hadnt been feelingc. isnt feeling d. wasnt feeling29. Scientists say it may be five or ten years _ it is possible to test this medicine on human patients.a. since b. when c. after d. before30. The ability to store knowledge makes computers different from every other machine _ invented.a. ever b. thus c. yet d. as31. Once environmental damage _, it takes many years for the system to recover.a. has done b. is to do c. does d. is done32. He _ when the bus came to a sudden stop.a. was almost hurt b. was hurt himselfc. was to hurt himself d. was hurting himself33. Some people viewed the findings with caution, noting that a cause-and-effect relationship between passive smoking and cancer remains _.a. to be shown b. to have shownc. to have been shown d. being shown34. _ conventional black ink costs newspaper about thirty cents a pound, most rub-resistant inks add at least ten cents more to the bill.a. While b. Furthermore c. Meanwhile d. Moreover35. How close parents are to their children _ a strong influence on the character of the children.a. has b. have c. having d. to have36. After _ for the job, you will be required to take a language test.a. being interviewed b. interviewedc. interviewing d. having interviewed37. Doing your homework is a sure way to improve your test scores, and this is especially true _ it comes to classroom tests.a. when b. since c. before d. after38. _ you as soon as I know what _.a. Ill phone does happen b. Ill phone has happenedc. I am phoning happens d. I am going to phone happens39. Ted had told me that he always escapes _ as he has got a very fast sports car.a. having fined b. fining c. being fined d. to have been fined40. I had just started back for the house to change my clothes _ I heard voices.a. as b. when c. after d. while41. Scarcely had we settled ourselves in our seats in the theatre _ the curtain went up.a. then b. when c. as d. after42. If Tom wins tomorrow, he _ thirty races in the past four years.a. will win b. has won c. would have wond. will have won43. Life is a candle _ to burn ever brighter.a. being meant b. meaning c. to mean d. meant44. I decided to go to the library as soon as I _.a. finish what I did b. finished what I didc. finished what I was doing d. would finish what I was doing45. No matter how frequently _, the works of Beethoven always attract large audiences.a. performed b. performing c. to be performed d. being performed46. _ when she started complaining.a. Not until he arrived b. Hardly had he arrivedc. No sooner had he arrived d. Scarcely did he arrive47. It _ seen to be believed.a. has b. has been c. has to be d. was48. In this experiment, they are wakened several times during the night, and asked to report what they _.a. had just been dreaming b. have just been dreamingc. are just dreaming d. had just dreamt49. Many a writer of newspaper articles _ to writing novels.a. has turned b. have turned c. have been turned d. has been turned50. Although _ Spanish, he attended the course.a. he was knowing b. he is knowingc. having a knowledge of d. knows51. Even if his letter _ tomorrow, it _ too late to do anything.a. will arrive is b. should arrive werec. arrives will be d. arrives would be52. By the middle of the 21st century, the vast majority of the worlds population _ in cities rather than in the country. a. are living b. will be living c. have lived dd. will have lived53. You should have put the milk into the ice-box, I expect it _ undrinkable.a. became b. had become c. has become d. becomes54. Television enable us to see things happen almost at the exact moment _.a. which they are happening b. they are happeningc. which they happen d. they have happened55. Our civilization cannot be thought of as _ in a short period of time.a. to have been created b. to be createdc. having been created d. being created56. All the flights _ because of the snowstorm, we had to take the train instead.a. were canceled b. had been canceledc. having canceled d. having been canceled57. Once _, this power station will supply all the neighboring towns and villages with electricity. a. it being completed b. it completedc. completed d. it completes58. Advertising media like direct mail, radio, television and newspapers _ to increase the sales of industrial products.a. have been used b. will be usedc. is being used d. has been used59. We will be losing money this year unless that new economic plan of yours _ miracles.a. is working b. works c. will be working d. worked60. It turned out that the children were not _ for the accident.a. to blame b. to be blamed c. to be blaming d. to have been blamed61. It _ to see so many children in that mountainous area cannot even afford elementary education. a. pains her b. makes her pain c. is paining d. is pained62. Our boss, Mr. Thompson, _ a raise in salary for ages, but nothing has happened yet.a. was promising b. has been promisingc. promised d. has promised63. Nowhere in nature is aluminum found free, owing to its always _ with other elements, most commonly with oxygen.a. being combined b. having combinedc. to combine d. combined64. If the door was not forced open, _ that the burglar must have had a key.a. it follows b. it is followed c. following is d. it will be followed65. The university of California, _ in 1868, is administered by president and governed by a twenty-four-member board of regents.a. founded b. has been founded c. to have been foundedd. was founded66. Any steam engine gives us an example of _ into work.a. heats having turned b. heats turningc. heats having been turned d. heat being turned67. Ill certainly work all next week except when it _.a. will be raining b. would rainc. will rain d. is raining68. He concluded his speech with a remark that failure _ the mother of success.a. is b. were c. was d. must be69. Great as Newton was, many of his ideas _ today and are being modified by the work of scientists of our time.a. are to challenge b. may be challengedc. have been challenged d. are challenging70. I think you are supposed _ your graduate study last year.a. to be finishing b. to have finishedc. to finish d. to have been finished71. The protection device can eliminate the faults _ they cause more damage.a. unless b. until c. before d. although72. Look at these clouds. _.a. It will rain b. Its going to rainc. It will be raining d. It is to rain73. _ the letter, I ran out of the room to the post office.a. Finishing b. No sooner that I had finished upc. As soon as I finished writing d. Since I finished up to write74. If only I _ what you wanted.a. knew b. know c. had known d. have known75. It was not until he took up fishing that he _ to relax.a. had been beginning b. beganc. had begun d. beginning76. No sooner _ than he realized that he should have remained silent.a. the words had spoken b. had the words spokenc. the words had been spoken d. had the words been spoken77. The publishers will send you a specimen copy of their new books _.a. when it will be requested b. when they are requested itc. when it is requested d. when requested78. Nancy hasnt begun working on her PH.D _ working on her masters. a. still because she is yet b. yet as a result she is stillc. yet because she is still d. still while she is already79. You _ where you leave your things.a. always forgets b. are always forgettingc. have always forgotten d. will always forget80. I _ to go to London today, but when the fortune-teller warned me not to travel, I postponed the trip.a. had intended b. was intending c. would intend d. was intended81. “I _ poetry as the food of the love,” said Darcy.a. have been used to considering b. have used to considerc. use to consider d. used to considering82. Since 1970, millions of enthusiasts _ a substance which they believe can remedy the common cold - Vitamin C.a. have taken b. have been taking c. have been takend. have being taken83. _ to be heading for closure, after the governments announcement on cuts.a. The hospital rumors b. The hospital is rumoredc. Someone rumors the hospital d. Someone is rumored the hospital84. I want _ the renovations before I start thinking about redecorating.a. to get done with b. to have got done withc. to be got done with d. to have been done with85. Paddock was not particularly intelligent but I felt sure I _ on his loyalty. a. could be counted b. could have been countedc. could be counting d. could count86. He gave what _ to an apology on behalf of his company.a. was amounted b. amountedc. was amounting d. is amounting87. _ beyond doubt that an accident caused the fire, the police will, naturally, release the man they are at present holding on suspicion of arson.a. Should it be proved b. Should it provec. Should someone be proved d. Should that be proved88. If you _, youd better go outside in the fresh air.a. faint b. have fainted c. are going to faint d. will faint89. It is ten years since I _ you last.a. see b. saw c. didnt see d. havent seen90. This rule _ to everyone who _ for this post.a. will apply will apply b. applies will applyc. will apply applies d. is applying is applying91. Are you suggesting that Joe _ the murder when you dont believe his alibi.a. commits b. will commit c. commit d. committed92. You look frozen. I _ you a cup of coffee.a. will make b. am going to make c. am making d. am to make93. She will be 21 _.a. come May b. when May is comingc. if May will come d. that May comes94. We _ our breakfast when an old man came to the door.a. just have had b. just hadc. have just had d. had just had95. The manager promised to keep me _ of how our business was going on.a. to be informed b. on informingc. informed d. informin