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---- May we leave the classroom now?
---- No, you _____. You _____ to leave until the bell rings.
A.mustn’t, are allowedB.can’t, aren’t supposed
C.don’t have to, are supposedD.needn’t, aren’t allowed
B
考查情景交际和情态动词。“我们现在可以离开教室了吗?”“不,你们不可以。你们不能离开,在铃声响起之前。”can’t表示允许,“不可以”;needn’t“不必”;be supposed to do sth.“应该做某事”。故选B。
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