Don't forget to________the lights when you leave the classroom．A.turn outB.turn intoC.turn offD.turn on
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C解析分析：turn out意思是“结果是，证明是”，如：It turned out that he was wrong．(结果证明他是错的)turn into＝change into＝bee(变成)，turn…into…＝change…into…意思是“把……变成……”，如：In freezing weather，water can turn into ice．本题的意思是“不要忘记关灯”，所以选turn off．