— Make sure all the lights when you leave the room.
— OK, I will.
A. turn on
B. are turn on
C. are turned off
D. turn off
网友回答
A. turn on
B. are turn on
(答案→)C. are turned off
D. turn off
解析：turn on打开； are turn on 语法错误，be动词一般不和原形动词连用；are turned off 被关掉； turn off关掉。句意：当你离开房间时，确信所有灯都被关掉了。句子主语是动作对象，故用被动语态。