you shuold ____ off your mobile phones .the meeting will start in a minute .A.to turn B.turning C.turn D.turned

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you shuold ____ off your mobile phones .the meeting will start in a minute .A.to turn B.turning C.turn D.turned

you shuold ____ off your mobile phones .the meeting will start in a minute .A.to turn B.turning C.turn D.turned
you shuold ____ off your mobile phones .the meeting will start in a minute .
A.to turn B.turning C.turn D.turned

you shuold ____ off your mobile phones .the meeting will start in a minute .A.to turn B.turning C.turn D.turned
选C.turn off 关掉.
should后面加动词原形.
你应该关掉手机,因为会议一分钟后就要开始了.