【題目】Attention, please! All the mobile phones _______ during the meeting.

A. are turn off B. have to turn off

C. should turning off D. must be turned off

【答案】D

【解析】

試題分析:句意:請注意!在開會期間所有的手機都必須要關(guān)閉。根據(jù)主語和謂語中間是動賓關(guān)系,所有用被動語態(tài),其結(jié)構(gòu)是be done.含有情態(tài)動詞的被動語態(tài)的結(jié)構(gòu)是:情態(tài)動詞 be done。結(jié)合句意,故選D。

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