We wish we ____ what you did when we were at high school.A.did B.could have done C.have done D.为什么是B.不应该是had done wish后的虚拟规定的很清楚，用had done 的形式，
问题描述：
We wish we ____ what you did when we were at high school.A.did B.could have done C.have done D.
为什么是B.不应该是had done
wish后的虚拟规定的很清楚，用had done 的形式，
答
wish 表示一种 虚拟语气
所以 b
时间状语从句 是一般过去式
所以 wish后 could would 等 have done
答
wish后用虚拟语气，加could 是一种猜测，
答
could have done 意思是本可以做而没做.与had done 都是对过去的虚拟 根据when we were at high school 语境都符合 但是前者的语气跟强烈一些 强调 本可以做而没做
答
wish 后的从句要用虚拟语气