----Did you open the door?
-----Yes. I remembered it before you arrived.
A. opening
B. being opened
C. to open
D. to have opened
网友回答
(答案→)A. opening
B. being opened
C. to open
D. to have opened
解析：动词用法辨析。Remember to do sth记得要做某事；remember doing sth记得做了某事；句意—你把窗户打开了吗？—是的。我记得在你来开之前我记得打开了。