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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

    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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