May we leave the classroom now? No, you . You to leave until the bell rings.A. mustn’t, ar

May we leave the classroom now? No, you . You to leave until the bell rings.
A. mustn’t, are allowed
B. don’t have to , are supposed
C. needn’t , aren’t allowed
D. can’t , aren’t supposed

A. mustn’t, are allowedB. don’t have to , are supposedC. needn’t , aren’t allowed(答案→)D. can’t , aren’t supposed解析：否定回答可用can't,mustn't或may not，may not 可能不，can't 不能够，mustn't 一定不，禁止；be allowed to被允许做某事；be supposed to应该，被期望做某事；句意：我们现在可以离开教室吗？不，你们不能。你们直到铃响才能离开教室。结合语境可知前文用can’t，mustn’t语气较重，may not语气太轻。同理，be allowed to语气则太重，故选D，为最佳答案。

我明天再问问老师，叫他解释下这个问题