--- Do we have to hand in our research reports this afternoon, Professor Smith?
--- Yes, you _______ . I will be waiting to check them all the afternoon.

A．shouldB．mayC．canD．must

D

解析試題分析：——史密斯教授，我們必須今天下午上交我們的研究報告嗎？
——是的，你們必須上交。下午我將要等待查看它們（研究報告）全部。
故應選D。A. should 應該 B. may 也許 C. can 能       
考點：情態(tài)動詞

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