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。