问题补充:
----Did you open the door?
-----Yes. I remembered it before you arrived.
A. opening
B. being opened
C. to open
D. to have opened
答案:
(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。