If my sister hadn't thought it over and over before making the decision,she______ a mistake.

问题描述:

If my sister hadn't thought it over and over before making the decision,she______ a mistake.
A.had made
B.made
C.would made
D.would have made

D.would have made这是表示与过去事实相反的虚拟语气的动词形式If 从句(要用had + 过去分词)+ 主句(要用would + have + 过去分词)此题可以从If 这个虚拟条件句中的动词形式 hadn't thought it over 看出是表示与...