——-We had a good time in dancing at a disco why didn't you go with us?——-I there but my

问题补充：

——-We had a good time in dancing at a disco, why didn you go with us?

——-I there, but my parents didn let me go.

A. couldn go

B. failed to go

C. hadn gone

D. would have gone

答案：

A. couldn go

B. failed to go

C. hadn gone

(答案→)D. would have gone

解析：考察时态，根据 why didn you go with us可知，回答的时候讲述的时态应当是过去式。根据but my parents didn let me go可知，该处用的是虚拟语气，即，我本来要去的，但是我的父母不让我去。

Would have done是对过去的虚拟