题目内容
—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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