I such a foolish mistake if I had been a little more careful.A. wouldn’t makeB. wouldn’t h

问题补充：

I such a foolish mistake if I had been a little more careful.

A. wouldn’t make

B. wouldn’t have made

C. hadn’t made

D. didn’t make

答案：

A. wouldn’t make

(答案→)B. wouldn’t have made

C. hadn’t made

D. didn’t make

解析：这道题是一个与过去事实相反的虚拟语气，if条件从句用的是过去完成时态，主句应用would have done 结构。因此答案选B.