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        1. --- May we leave the classroom now?
          --- No, you ____________ . You ____________ to leave before the bell rings.
          A.mustn’t, are allowed B.don’t have to, are allowed
          C.needn’t, aren’t allowed D.can’t, aren’t allowed
          D
          mustn’t 語氣非常重,表示“一定不要,禁止”等,一般不輕易用;can’t語氣相對輕一些,常常用作may的否定;另外,當may表示推測“可能”時,其否定為:may not。跟據(jù)上文可知,D為最佳答案,不,你不能。鈴響之前不許你離開。
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