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—— 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

【解析】

試題分析:考查情態動詞。should have done本應該做某事,must have done表是對過去的一種虛擬,一定做某事;shouldn’t have done表示本不應該做事但是做了”, mustn’t表示禁止。句意:——對不起,史密斯教授,我沒有完成昨天的作業。——哦,你本應該把它做完,但是你沒有做完。因為昨天是截止期限。故C正確。

考點:考查情態動詞

 

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