Attention, please. All mobile phones must before the meeting starts. [ ]A. turn B. be turned offC. be turning-初中英语-n多题

◎ 题干

Attention, please. All mobile phones must before the meeting starts.

[ ]

A. turn
B. be turned off
C. be turning

◎ 答案

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◎ 解析

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◎ 知识点

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