21.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

　　22.The elephants ought ______ hours ago by the keepers.

　　a. to be fed

　　b. to feed

　　c. to being fed

　　d. to have been fed

　　23.“I wonder why they’re late.” “They ______ the train.”

　　a. can have missed

　　b. could miss

　　c. may have missed

　　d. might miss

　　24.“Tom graduated from college at a very young age.”

　　“He ______ have been an outstanding student.”

　　a.

　　must

　　b. could

　　c. should

　　d. might

　　25.You ______ the examination again since you had already passed it.

　　a. needn’t have taken

　　b. didn’t need to take

　　c. needn’t take

　　d. mustn’t take

　　26.He is really incompetent! The letter ______ yesterday.

　　a. should be finished typing

　　b. must be finished typing

　　c.must have finished typing

　　c. should have been finished typing

　　27.The boy told his father that he would rather ______ an astronaut.

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