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题目
题型:不详难度:来源:
All mobile phones must        during the meeting.
A、turn off                 B、are turned               C、be turned off
答案
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。
核心考点
试题【All mobile phones must        during the meeting.A、turn off                 B、ar】;主要考察你对动词的被动语态等知识点的理解。[详细]
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