Attention,please!All mobile phones must __ during the meeting.选项A turn B be turned off C are turn

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Attention,please!Allmobilephonesmust__duringthemeeting.选项AturnBbeturnedoffCareturnAttention,please!A

Attention,please!All mobile phones must __ during the meeting.选项A turn B be turned off C are turn
Attention,please!All mobile phones must __ during the meeting.选项A turn B be turned off C are turn

Attention,please!All mobile phones must __ during the meeting.选项A turn B be turned off C are turn
B be turned off---------切断电源,关闭