问题描述：
may的否定
May I come in?
No,you _____.You should wait outside for your turn.
A couldn't B needn't C mustn't D won't
顺便说明理由
May I come in?
No,you _____.You should wait outside for your turn.
A couldn't B needn't C mustn't D won't
顺便说明理由
问题解答：
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