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　　1.Since the road is wet this morning, ____last night.

　　A.it must rain

　　B.it must be raining

　　C.it must have rained

　　D.it must have been rained

　　【精析】C

　　2.As teachers we should concern ourselves with what is said, not what we think____ .

　　A.ought to be said

　　B.must say

　　C.have to be said

　　D.need to say

　　【精析】A

　　3.You ____all those calculations. We have a computer to do that sort of thing.

　　A.must not have done

　　B.should not haveC.can not have done

　　D.needn’t have done

　　【精析】D

　　4.With all this work on hand, he____ to the cinema last night.

　　A.mustn’t goB.wouldn’t goC.oughtn’t go

　　D.shouldn’t have gone

　　【精析】D

　　5.“I saw Mary in the library yesterday.” “You ____her, she is still in hospital.”

　　A.mustn’t have seen

　　B.can’t have seen

　　C.could not see

　　D.must not see

　　【精析】B