Don’t forget the lights before you go to bed.A. turn off B. turning offC. to turn offD. t

问题补充：

Don’t forget the lights before you go to bed.

A. turn off

B. turning off

C. to turn off

D. turns off

答案：

A. turn off

B. turning off

(答案→)C. to turn off

D. turns off

解析：句意：在你睡觉前，不要忘了关灯。Forget后接不定式表示不要忘记做某事，还没做；接动名词表示忘记做了某事，已做。结合语境可知选C。