—Remember to turn off the lights when you leave the room.— .A. OK. I willB. No, I won’tC.

—Remember to turn off the lights when you leave the room.
— .
A. OK. I will
B. No, I won’t
C. It doesn’t matter
D. I know that

(答案→)A. OK. I willB. No, I won’tC. It doesn’t matterD. I know that解析：祈使句的回答。祈使句的动作通常是表示将来发生的动作，所以回答祈使句时，一般用will或won’t。根据句意：当你离开房间时，记得关灯。可知A为正确答案。

好好学习下