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

1、D

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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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