All mobile phones must _______during the meeting __________we call hear the report clearly．
A．keep away；ever since B．not open：until
C．be kept closed；if D．be turned off：so that
科目：初中英語(yǔ) 來(lái)源： 題型：
All mobile phones must _______during the meeting __________we call hear the report clearly．
A．keep away；ever since B．not open：until
C．be kept closed；if D．be turned off：so that
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