问题描述：
英语选择May I go swimming now?
May I go swimming now?
--- No,you ______.You must finish your homework first.
A.mustn’t B.may not C.couldn’t D.needn’t
May I go swimming now?
--- No,you ______.You must finish your homework first.
A.mustn’t B.may not C.couldn’t D.needn’t
问题解答：
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