题目内容
Please make sure all the lights are ______ before you go to bed.
| A.turned on | B.turned down | C.switched off | D.switched on |
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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