______ 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

答案及解析： C

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。