—Can we leave the classroom now?
—No, you _________. You _________ to leave until the bell rings.
A．don’t have to; are supposedB．mustn’t; are allowed
C．needn’t; aren’t allowedD．can’t; aren’t supposed
D

試題分析：句意：現(xiàn)在我們能離開教室了嗎?不,不能. 直道鈴響你才能離開. don’t have to不必; mustn’t禁止,不許可; needn’t不必, can’t不能.第二個空考察的是not…until的用法。結(jié)合句意，故選D
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