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    精英家教网 > 高中英语 > 题目详情

    Don’t touth anything unless _______ .

    A．to be allowed B．allowed C．to be allowing D．allowed to

    B

    解析试题分析：句意：不要触摸任何的东西除非被允许。这里用了状语从句的省略。完整的句子是：unless you are allowed to touch，当主从句的主语一致的时候，可以省略从句的主语和be动词，选B。
    考点：考查状语从句的省略

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