-- Why didn’t you go to Mike’s birthday party yesterday?-- Well I but I forgot it.A. sh

问题补充：

-- Why didn’t you go to Mike’s birthday party yesterday?

-- Well, I , but I forgot it.

A. should

B. would

C. should have

D. must have

答案：

A. should

B. would

(答案→)C. should have

D. must have

解析：这是一组对话。上文，昨天，你为什么没去参加Mike的生日聚会？下文，我本应该去的，但是我忘记了。Should have done本该做某事，而实际上没有做某事。