题目内容：

We wish we ____ what you did when we were at high school
A. did B. could have done C. have done D. should do

优质解答

答案是B,对过去的事情的但愿.
在这里,could have done==had done--------但在你的语境裏面,一般是had done,尽管也可以是could have done.

追问：

对过去的事情的但愿 这怎样看？