Unit 4 CyberspaceⅡ 每课一练（北师大必修2）2

Unit 4 Cyberspace.用所给动词的适当形式填空1.If Bill (tell) me yesterday， I should know what to do now.答案：had told2.Without electricity human life (be) quite different today.答案：would be3.Jane (be) prettier， but she doesnt care much about her clothes.答案：could be4.If you dont lose heart， you (succeed).答案：will succeed5.If my brother (be) here， everything would be better.答案：were6.He (give) you more help， but he was so busy at that time.答案：would have given7.If he (come)， he will bring his violin.答案：comes8.If you had taken the medicine yesterday， you (be) well now.答案：would be.单项填空1.If you to the moon next Friday， we would follow you there.A.could fly B.would flyC.should fly D.might fly解析：考查和将来事实相反的虚拟条件句。和将来事实相反的if从句要用一般过去时，should动词原形或were to动词原形，故答案为C。答案：C2. ， John would not have failed.A.If he has listened to meB.Had he listened to meC.If he listened to meD.As soon as he listened to me解析：考查虚拟条件句。句意：如果听了我的话，约翰就不会失败。在此虚拟条件句中，if省略，要把had提到主语之前，故选B。答案：B3.Yesterday Jane walked away from the discussion.Otherwise， she something she would regret later.A.had said B.saidC.might say D.might have said解析：分析题干，前一分句暗示了过去的事实，而句中副词otherwise暗示了条件，并说明了后一分句中的一个非真实情况，表示与过去事实相反。后一分句实际上省略了一个与过去事实相反的条件句If she had not walked away from the discussion， 故后一分句应视为省略了条件句的主句结构，与过去事实相反，应选用might have said。答案：D4. he you， he make so serious a mistake.A.Were； couldnt B.Was； couldntC.If； wouldnt D.Had； wouldnt解析：句意：如果他是你，他就不会犯这么严重的错误。该虚拟条件从句省略了连词if， were 被提到了句首，形成倒装语序，故选A。答案：A5.But for water， it impossible to live in the desert.A.is B.wasC.were D.would be解析：but for water表示“要是没有水的话”，代替由if引导的非真实条件状语从句，表示与现在情况相反的一种假设，所以，谓语应用would be。答案：D6.They must have enjoyed themselves there， otherwise they so long.A.cant have stayed B.wouldnt have stayedC.cant stay D.wouldnt stay解析：句意：他们一定在那儿玩得很高兴，否则他们不会待这么长时间。表示对过去事实的虚拟，要用“情态动词would/should/could/mighthave done”的结构，故选B。答案：B7.This printer is of good quality. If it break down within the first year， we would repair it at our expense.A.would B.shouldC.could D.might解析：句意：这台打印机质量好。如果在第一年内坏了，我们将承担修理费。题干中的第二句的主从句都是对将来事实的虚拟，所以从句采用“should动词原形”的结构，故选B。答案：B8.If he his legs in the last training， he the coming World Cup， which he has been longing to compete in.A.hadnt hurt； would join inB.hadnt hurt； would have taken part inC.didnt hurt； would go in forD.didnt hurt； would have taken part in解析：句意：如果他在上次训练中腿没有受伤的话，他就能参加他一直向往的即将到来的世界杯了。该题是含有混合虚拟条件句的复合句，从句是对过去事实的虚拟，而主句则是对将来事实的虚拟，故选A。答案：A9.Had Li Hua received six more votes in the election of our class， he our monitor now.A.must have been B.would have beenC.were D.would be解析：条件句是对过去事实的虚拟，而主句是对现在的虚拟。答案：D10. him not to do so， he wouldnt have made such a serious mistake.A.Did I persuade B.If I persuadeC