Don’t forget all the lights when you leave the classroom.A. to turn offB. turning offC. t

问题补充：

Don’t forget all the lights when you leave the classroom.

A. to turn off

B. turning off

C. turn on

D. turning on

答案：

(答案→)A. to turn off

B. turning off

C. turn on

D. turning on

解析：考查forget的用法，forget to do 意为忘记去干某事 forget doing 忘记做过某事

句意为，不要忘记去关掉所有的灯，当你离开教室的时候。