Don’t forget to the lights before you leave the classroom.A. turn downB. turn onC. turn o

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。