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

问题补充：

— Why didn’t you come to Mike’s birthday party yesterday?

— Well, I , but I forgot it.

A. should

B. must

C. should have

D. must have

答案：

A. should

B. must

(答案→)C. should have

D. must have

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