–Sorry, Professor Smith. I didn’t finish the assignment yesterday.
--Oh, you _____ have done it as yesterday was the deadline.
A. must     B, mustn’t      C, should      D. shouldn’t
C

試題分析：考查should have done的固定句型，意思“本應(yīng)該做某事，must have done表是對(duì)過去的一種虛擬，一定做某事；shouldn’t have done表示本不應(yīng)該做事但是做了”， mustn’t表示禁止，句子意思“你本應(yīng)該把它做完，但是你沒有做完因?yàn)樽蛱焓墙刂蛊谙蕖�，所以選C
點(diǎn)評(píng)：should have done的固定句型是�？純�(nèi)容，要知道它的意思，遇到此類題時(shí)，就很容易做出正確選擇
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