Attention，please! All the mobile phones _____________during the meeting．
A．must keep off B．have to keep off
C．are keeping off D．must be kept off
科目：初中英語 來源： 題型：
Attention，please! All the mobile phones _____________during the meeting．
A．must keep off B．have to keep off
C．a(chǎn)re keeping off D．must be kept off
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