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—Could you please have a walk with me?
—Sorry, I _______. I have something important to do now.

A.mustn’t B.needn’t
C.can’t D.may not

C

解析试题分析:句意:—你能和我走走吗?— 对不起,我不能。现在我有重要的事情要做。A. mustn’t不可以,表禁止;B. needn’t不必;C. can’t不能;D. may not可能不。Could在这里表示语气婉转、客气,所以用can’t 回答不能,故选C。
考点: 考查情态动词的用法。

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