过去完成进行时的应用

过去完成进行时的应用 过去完成实行式（Past Perfect Progressive Tense） 如果我们要强调较早发生事件的连续性，我们能够用过去完成实行式。占去完成实行式和现在实行式惟一不同的地方是 verb to have 的地方一定要用had 。 以下是一些过去完成实行式的例子： 1. I had been watching TV before you called me. 2. I had been working hard in a company for many years before I went to college. 3. He had been studying before he went to class. 4. He had been driving all day before he went to sleep. I. 过去完成时/过去完成实行时 练习： 1. He _ more than 5,000 English words when he entered the university at the age of 15. A. has learned B. would have learned C. learned D. had learned 2. They _ on the program for almost one week before I joined them, and now we _ on it as no good results have come out so far. A. had been working; are still working B. had worked; were still C. have been working; have worked D. have worked; are still working 3. Father _ for London on business upon my arrival, so I didnt see him. A. has left B. left C. was leaving D. had left 4. When the old man _ to walk back to his house, the sun _ itself behind the mountain. A. started; had already hidden B. had started; had already hidden C. had started; was hiding D. was starting; hid 5. The policemans attention was suddenly caught by a small box which _ placed under the Ministers car. A. has been B. was being C. had been D. would be 6. Hurry up! Alice and Sue are waiting for you at the school gate. Oh! I thought they _ without me. A.went B. are going C. have gone D. had gone II.用所给动词（词组）的适当形式填空。 1.We _ (look forward to) the singers coming before the news arrived that he was delayed by the bad weather. 2.He _ (wait) for two hours. He was still _(wait). 3.Mary _ (suffer) from ill health before he was sent to hos