There was a lot of fun at yesterday's party.You come but why didn't you?A. must haveB. sh

问题补充：

There was a lot of fun at yesterdays party.You come，but why didn you?

A. must have

B. should

C. need have

D. ought to have

答案：

A. must have

B. should

C. need have

(答案→)D. ought to have

解析：

该空含你本来应来但实际未来之意，应填ought to have。