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---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

试题分析:句意:我们现在可以离开教室吗?不,你们不能,直到下课铃响了,才可以离开。can’t表示不能够,用于回答may的提问,be supposed to do sth应该做某事,故选D
点评:情态动词是中考的必考语言点。情态动词表必要性时用must(必须)与don’t have to / needn’t(不必要);表推测时用must (肯定、一定)与 can’t/couldn’t (不可能);表请求和许可时can/may(可以、能够)与can’t/mustn’t(禁止、不许)。
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