a little more time to think, he might have acted more sensibly.
A. If he took
B. If he has taken
C. had he taken
D. Should he take
网友回答
A. If he took
B. If he has taken
(答案→)C. had he taken
D. Should he take
解析： 考查在条件句中与过去事实相反的虚拟语气。其结构为：if+主语+had done,主语+would/could/might+have done ,省略if要倒装，had往前提，故选C。