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All mobile phones must _______during the meeting __________we call hear the report clearly

Akeep awayever since             Bnot openuntil

Cbe kept closedif                 Dbe turned offso 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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