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-May we leave the classroom now?
-No, you _______. You _______ to leave until the bell rings.
A.can't; are allowedB.mustn't; aren't allowed
C.needn't; are allowedD.needn't; aren't allowed
B

试题分析:句意:我们现在可以离开教室了吗?不,不能。直到响铃你们才可以离开。May引导的一般疑问句,肯定回答用may;否定回答用can’t或者mustn’t。not…until“直到……才”。故选B。
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