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    How can school ban mobile phones completely __________ some of the parents simply don’t follow the rule?

    A. unless????????????? ????????????? ????????????? B. when????????????? ????????????? ????????????? ????????????? C. until????????????? ????????????? ????????????? ????????????? D. before

     

    【答案】

    B

    【解析】

    试题分析：句意：当一些家长不遵守规则的时候，学校怎么能完全禁止手机呢？when 表示“当…时候”，unless????????????? 表示除非，until表示直到…，before表示在…之前，故选

     

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