答案D 解析：离开教室之前关灯.本考题四个词组常考,turn on“开(电灯,自来水,煤气,收音机等)”；turn off“关上(电灯,自来水,煤气,收音机等)”；turn up“扭大(灯火,煤气,收音机等)”；turn down“旋小(油灯,炉子,电扇,煤气,收音机等)”.查看原帖
Before you leave the classroom,please ________the lights．
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