问题描述：
May we leave the classroom now No,you-----.you --------to leave until the bell rings 的填空怎么
有四个选项 A.mustn't ; are allowed B.don't have to; are supposed C.needn't ; aren't allowed D.can't ; aren't allowed 请详解
有四个选项 A.mustn't ; are allowed B.don't have to; are supposed C.needn't ; aren't allowed D.can't ; aren't allowed 请详解
问题解答：
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