问题 选择题

Please make sure all the lights are ______ before you go to bed.

A.turned on

B.turned down

C.switched off

D.switched on

答案

答案:C

短语辨析。   A.打开    B.减小;调低    C.关掉;切断电源 D. 开启。句意:请确认在你睡觉前所有的灯都被关掉了。这里强调是关掉电源。故选C。

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