Remember to the lights before you leave the classroom.A. turn offB. turn onC. turn upD. t

问题补充：

Remember to the lights before you leave the classroom.

A. turn off

B. turn on

C. turn up

D. turn down

答案：

(答案→)A. turn off

B. turn on

C. turn up

D. turn down

解析：句意：记住离开教室前关灯。turn off关； turn on开；turn up放大； turn down调低。所以选A。