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— May we leave the classroom now?
— No, you _______. You _______ to leave until the bell rings.
A.mustn’t; are allowed B.can’t; aren’t allowed
C.don’t have to; are allowed D.needn’t; aren’t allowed
B

试题分析:may的否定回答应该用can’t,表示不能,不可以;而mustn’t表示禁止,一般不做否定回答;don’t have to表示不必;needn’t是must的否定回答,表示“不必”。所以本题选B。
点评:本题可以只根据第一个空做出选择,第二个空是一个被动语态,本句表示“直到铃响你才能出去。”你是被允许的。
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