---- 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
考查情景交際和情態(tài)動(dòng)詞�！拔覀儸F(xiàn)在可以離開教室了嗎？”“不，你們不可以。你們不能離開，在鈴聲響起之前。”can’t表示允許，“不可以”；needn’t“不必”；be supposed to do sth.“應(yīng)該做某事”。故選B。
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