题目内容

-May we leave the classroom now?
-No, you ______. You ______ to leave until the bell rings.
A．mustn’t, are allowedB．don’t have to, are supposed
C．needn’t, aren’t allowedD．can’t, aren’t supposed
D
考察情态动词否定回答及allow和suppose用法. mustn’t,禁止don’t have to, 不必needn’t,不必can’t不能.be supposed to应该,被期望做某事,be allowed  to do sth 被允许做某事.根据题意,我们现在可以离开房间了吗？——不，你们不能。你们铃响之前别想 离开。选D。
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