-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
考察情態(tài)動詞否定回答及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應該,被期望做某事,be allowed  to do sth 被允許做某事.根據(jù)題意,我們現(xiàn)在可以離開房間了嗎？——不，你們不能。你們鈴響之前別想 離開。選D。
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