Tell the boy to all lights as he leaves the room.A. take offB. switch onC. switch offD. t

问题补充：

Tell the boy to all lights as he leaves the room.

A. take off

B. switch on

C. switch off

D. turn on

答案：

A. take off

B. switch on

(答案→)C. switch off

D. turn on

解析：短语辨析。A. 起飞；脱下 B.接通；开启 C. 关掉；切断 D. 打开；发动。句意：告诉这个男孩当他离开房间时关掉所有的灯。故选C。