问题补充:
Don’t forget to the lights before you leave the classroom.
A. turn down
B. turn on
C. turn off
D. turn up
答案:
A. turn down
B. turn on
(答案→)C. turn off
D. turn up
解析:四个选项分别表示拒绝、开、关上和翻起,根据题意选C,你离开教室前不要忘了关灯。
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