大学英语语法专题练习情态动词与动词的时态和语态1. Dinosaurs（恐龙）are thought to _____________ millions of years ago.A)die out B)have died outC)having died out D)dying out2. By next summer he _______________ at Harvard University for five years.A)will have been studying B)will studyC)have studied D)will be studying3. When Jim __________ his own house, he will install built-in stereo speakers in every room.A)has B)will haveC)had D)had been4. This is one of the rarest questions that ____________ at such a meeting.A)has ever been raised B)are raisedC)have ever been raised D)is raised5. I will overlook ________ so rude to my sister this time. But don’t l et it happen again.A)you to be B)you to have beenC)your being D)your having been6. At last she left her house and got to the airport, only __________ the plane flying away.A)to see B)sawC)to have seen D)having seen7. _________ ,the students knew it was time to begin class.A)To have heard the bell B)To hear the bellC)Heard the bell D)Hearing the bell8. He won't be free Saturday morning. He __________a meeting.A)shall be attending B)is attendingC)has attended D)shall have attended9. She ___________ to see you yesterday, but it rained heavily thenA)wished to have come B)must have comeC)came D)had to come10. By the end of this month, he ___________ his second novel.A)have finished B)will be finishingC)will have finished D)is finishing11. When he hurried to the airport, he found, to his great disappointment, his ticket and passport _______ at home.A)were left B)had leftC)to have been left D)had been left12. The policeman rushed to the spot the minute he ________ of the traffic accident.A)have heard B)heardC)hears D)will hear13. I want to go to school, but you _________ with me.A)need not to go B)need not goC)do not need go D)need go not14. He ___________ his parents about his failure in the examination.A)dares not tell B)dare not tellingC)dare not tell D)dare not to tell15. The structure of aircraft _________ all the time.A)is being changed B)has been changedC)is been changed D)is being changing16. Three officers narrowly escaped ___________ in the fierce battle.A)to be killed B)to kill C)having killed D)being killed17.-- Was the driving pleasant when you vacationed in the countryside last summer?--No, it __________for four days when we arrived, so the roads were very muddy.A)was raining B)would be raining C)have rained D)had been raining18. Now that we ______ so far, we may as well go all the way.A )come B)are coming C)had come D)have come19. Ever since the family moved to the suburbs last year, they _________better health.A)could have enjoyed B)have been enjoying C)had enjoyed D)are enjoying20. Whenever we visited them, they ____________television.A)have watched B)had watched C)watch D)were watching21. As we were cleaning the office, he ___________ here to work.A)was coming B)came C)comes D)is coming22. We have done things we ought not to have done and _____________ undone things we ought to have done.A)leaving B)left C)will leave D)leave23. The goods ___________ when we arrived at the airport.A)were just unloading B)had just unloadedC)were just being unloaded D)were just been unloaded24. There seemed little hope that the explorer, ____________in the tropical forest, would find his way through it.A)to be deserted B)to have been deserted C)having deserted D)having been deserted25. I appreciated __________ the opportunity to study abroad two years ago.A)having been given B)to have been given C)having given D)to have given26. Nowhere in nature is aluminum found free, owing to its always ________ with other elements, most commonly withoxygen.A)combined B)having combined C)combine D)being combined27. A beam of light will not bend round corners unless __________ to do so with the help of a reflecting device.A)to be made B)being made C)made D)be made28. The delegation has already arrived, but I didn't know it ________ until this morning.A)will come B)had been coming C)was coming D)comes29. I don't think she'll be upset, but I'll see her in case ___________.A)she'll B)she is C)she does D)she would30. I __________ something unpleasant; they must be preparing hydrogen sulphide（硫化物）.A)am smelling B)have had smelled C)smell D)have been smelling【key and explanation】1．答案B。

部分动词的被动形式，如be believed／found／known／reported／said／supposed／though后常跟不定式完成式，表达“据信，据知，据报道”等意思，不定式的动作发生在被动结构(谓语动作)所表示的动作之前。

依据上述用法要求，可排除A、C、D 三项。