题目内容
【题目】
Whoever leaves the office last must make sure the light is __________.
A. switched on
B. switched off
C. switched over
D. switched to
【答案】B
【解析】句意:无论是谁最后离开办公室,必须确保把灯关了。switch on(用开关)开启;switch off(用开关)关掉;switch over切换,转变;switch to转变。
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