—Boys, please don’t forgetthe lights when you leave the classroom.—We , sir.A. to turn off

—Boys, please don’t forget the lights when you leave the classroom.
—We , sir.
A. to turn off, won’t B. turning off, won’t C. to turn off, will

解析：forget后接不定式表示不要忘记去做某事，接动名词表示忘记做过某事。句意：孩子们，当你们离开教室时，请不要忘了关灯。——我们不会的忘记的，老师。结合语境可知选A。

我好好复习下