Mobile phones must be kept off d the meeting.——青夏教育精英家教网—

摘要： Mobile phones must be kept off d the meeting.

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(改写) Mobile phones must be kept off d_ the meeting.

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

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

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