— 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(píng):本題可以只根據(jù)第一個(gè)空做出選擇,第二個(gè)空是一個(gè)被動(dòng)語(yǔ)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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