18. Peter _____ come with us tonight,　 but he isn’t very sure yet.

A. must　　 B. may　 C. can　　 D. will

答：B。从后一句 he isn’t very sure yet 可判断B项，may可能。

17. I didn’t see her in the meeting room this morning. She___________ at the meeting.

A. mustn’t have spoken

B, shouldn’t have spoken

C. needn’t have spoken

D. couldn’t have spoken

答：D。表示“一定不”，应用couldn’t。must仅用于肯定句中表示推测，故排除A项。

16. The new airport___________ if they had not stopped working on it.

A. would complete　　 B. had been completed

C. had completed　　

D. would have been completed

答：D。从句为过去完成时，主句应用“would(should，mlgh，could)+现在完成式”，表示与过去事实相反的虚拟语气。

15. Tom ought not to _______ me your secret, but he meant no harm.

A. have told　　 B. tell　　　

C. be telling　　 D. having told

答：A。ought not to have done 本不应该做但实际上做了的事

14. -Shall we go skating or stay at home?

　 -Which _______do yourself?

A. do you rather　　　　 B. would you rather

C. will you rather　　　 D. should you rather

答：B。 would rather (not) do 宁愿(不)做

13. A computer__________ think for itself~ it must be told what to do.

A. can’t　　　　 B. couldn’t　

C. may not　　　 D. might not

答：A。can表示“能力”。

12. You have to get there before eight o’clock.　 You __________ now.

A. need go　　　　　　 B. need to go

C. need have gone　　　 D. need to have gone

答：B。need做情态动词用时，仅用于疑问或否定句中。

11. If you go from Changehun to Beijing, you ________ a passport.

A. needn’t　　　　 　B. don’t need

C. needn’t to have　　　 D. oughtn’t need

答：B。情态动词有三个特点；①不能单独做谓语　 ②设有人称和数的变化 ③(除ought外)接省去to的动词不定式。

10. -Could 1 borrow your dictionary? ______ Yes, of course you__________.

A. might　　 B. will　　 C. can　　 D. should

答：C。could，might，would用来提问时，表示语气婉转的，客气。因此，用can，may或will来回答。如：

① -Might 1 sit here?　　

　 -Yes, you may.

② -Would you remember me to your parents?

　 -Thank you. I will.

9. He _______ you more help, even though he was very busy.

A. might have given　　　　 B. might give

C. may have given　　　　　 D. may give

答：A。此题相当于 If you had asked him for help, he might have given you more helpo