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All mobile phones must during the meetin...

All mobile phones must         during the meeting.

A、turn off                                             B、are turned                              C、be turned off

 

C 【解析】 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。 考点:情态动词的被动语态。
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