问题补充:
I have been working with Lily for years, and never before her so serious!
A. I found
B. I have found
C. did I find
D. have I found
答案:
A. I found
B. I have found
(答案→)C. did I find
D. have I found
解析:句意:我和Lily共事多年,从来没见过她如此严肃。never置于句首,后面要用部分倒装。