題目列表(包括答案和解析)
Attention, please! All the mobile phones ______ during the meeting.
A. must keep off B. have kept off C. are keeping off D. must be kept off
Attention, please! All the mobile phones ______ during the meeting.
A. must keep off B. have kept off C. are keeping off D. must be kept off
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
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