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    精英家教网 > 初中英语 > 题目详情
    All mobile phones must        during the meeting.
    A、turn off                 B、are turned               C、be turned off
    C

    试题分析：句意：在会议期间所有的电话必须都关上。turn off   关上，本句主语All mobile phones是动作turn off   的承受者，所以要用被动语态，而且是情态动词的被动语态，情态动词+be+动词的过去分词，故选C。
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