Tell the boy to ______ all lights as he leaves the room.
A．take offB．switch onC．switch offD．turn on
C
短語辨析。A. 起飛；脫下   B.接通；開啟   C. 關(guān)掉；切斷  D. 打開；發(fā)動(dòng)。句意：告訴這個(gè)男孩當(dāng)他離開房間時(shí)關(guān)掉所有的燈。故選C。
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