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    21．. -- 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 【查看更多】

     

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     ( 上海卷29). -- 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

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