26. We were all surprised when he made it clear that he ____________ office soon.

A. leaves　　　　 B. would leave　

C.　 left　　　　 D. had left

答；B。主句是过去时，从句应用过去式。would leave为过去将来时。

25. Tom ______ into the house when no one

A.　 slipped, was looking　　　

B. had slipped, looked

C. slipped, had looked　

D. was slipping, looked

答：A．slip这一瞬间动作，发生在另一延续性动作之中。

24. If city noises __________ from increasing, people _________ shout to be heard even at the dinner table 20 years from now.

A. are not kept, will have to　　

B. are not kept, have

C. do not keep, will have to　

D. do not keep, have to

答：A。在土从复合句中，若主句是将来时，从句一般用现在时代替将来时，“阻止噪音”应用被动语态

23. -We could have walked to the station, it was so near.

-Yes, a taxi ________ at all necessary.

A. wasn’t　　　　 B. hadn’t been

C. wouldn’t be 　　D. won’t be

答：A。出租车没必要是真实情况。

22. -Do you know our town at all?

　 -No, this is the first time I_________here.

A. was　　　　　 B. have been　

C. came　　　　 D. am coming

答：B。This is the first (second...) time that...句式中，从句常用现在完成时。

21. When Jack arrived he learned Mary ________ for almost an hour.

A. had gone　　 B. bad set off

C. had left　　　 D. had been away

答：D。go为暂短性动词，其完成时后不能接表示一段时间的状语。此类动词还有come, arrive, leave, join, marry, die, buy, begin, start, fallo

20. The students __________ busily when Miss Brown went to get a book she________ in the office.

A. had written, left　　 B. were writing, has left

C. had written, had left

D. were writing, had left

答：D．when意为“当……时”，表示当一个动作发生时，另一动作正在进行。根据句中的时态可知，后一空用had left，表示动作发生在过去的过去。

19. When I was at college f__________ three foreign languages, but l__________ all except a few words of each.

A. spoke, had forgotten　

B. spoke, have forgotten

C. had spoken, had forgotten　 　

D. had spoken, have forgotten

答：B．“我在大学时，能说二门外语”应用过去时，“但现在都已忘了”应用现在完成时，强调对现在产生的结果或影响。

18. The police found that thc house__________ and a lot of things

A. has broken into. has stolen　　

B. had broken into, had been stolen

C. has been broken into. stolen　

D. had been broken into, stolen

答：D。过去完成时表示动作发生在过去的过去，根据found一词可判断用过去完成时，应用被动语态．stolen是had been stolen的省略式。

17. -Have you finished the work’?

　 -No. I ____ you wanted me to do it at once.

A. don’t realize　　　 B. didn’t realize

C. haven’t realized　　 D. am not realizing

答：B．“我没有意识到”是指早没有意识到，以前没有意识到，故应用一般过去时。