【題目】Attention,please!All the mobile phones must________before the meeting starts

Aturn off

Bbe turned off

Cbe turning off

Dturned off

【答案】B

【解析】情態(tài)動詞的被動語態(tài)由情態(tài)動詞be動詞的過去分詞構(gòu)成。

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