13. I'm sorry, but I had no alternative. I simply ________ what I did.

　　A. must do

　　B. had to do

　　C. ought to have done

　　D. have to do

　　14. Time is running out，________？15. No one ________ that to his face.

　　A. dares say

　　B. dares saying

　　C. dare say

　　D. dare to say

　　16. You ________ last week if you were really serious about your work.

　　A. ought to come

　　B. ought to be coming

　　C. ought have come

　　D. ought to have come

　　17. The elephants ought ________ hours ago by the keepers.

　　A. to be fed

　　B. to feed

　　C. to being fed

　　D. to have been fed

　　18. — I wonder why they're late.

　　?They ________ the train.

　　A. can have missed

　　B. could miss

　　C. may have missed

　　D. might miss

　　e19. — Tom graduated from college at a very young age.

　　桯e ________ have been an outstanding student.

　　A. must

　　B. could

　　C. should

　　D. might

　　u20. He is really incompetent! The letter ________ yesterday.

　　A. should be finished typing

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