【題目】Attention,pleaseAll 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(dòng)詞的被動(dòng)語態(tài)由情態(tài)動(dòng)詞be動(dòng)詞的過去分詞構(gòu)成。

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