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Tell the boy to ______ all lights as he leaves the room.
A.take offB.switch onC.switch offD.turn on
C
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。
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