---Sorry, Professor Smith. I didn't finish the assignment yesterday.
---Oh, you      have done it as yesterday was the deadline.
A．mustB．mustn'tC．shouldD．shouldn't
C

試題分析：句意：--對不起，史密斯教授，我昨天沒有完成作業(yè)。--哦，你應該早完成它，因為昨天是最后期限。should have done指過去應該做的還未做，故選C。
點評：本題難度適中。
即學即練：I didn't know his telephone number， otherwise I ______ him.
A. had telephoned           B. would telephone    
C. would have telephoned     D. telephone
解析：C。句意：我不知道他的電話號碼，要不然的話，我就給他打電話了。
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