— 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

試題分析：may的否定回答應(yīng)該用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”。所以本題選B。
點(diǎn)評：本題可以只根據(jù)第一個空做出選擇，第二個空是一個被動語態(tài)，本句表示“直到鈴響你才能出去�！蹦闶潜辉试S的。
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