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All mobile phones must        during the meeting.
A、turn off                 B、are turned               C、be turned off
C

試題分析：句意：在會議期間所有的電話必須都關上。turn off   關上，本句主語All mobile phones是動作turn off   的承受者，所以要用被動語態，而且是情態動詞的被動語態，情態動詞+be+動詞的過去分詞，故選C。
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