There was a lot of fun at yesterday’s party. You but why didn’t you? A. should comeB. ma

问题补充：

There was a lot of fun at yesterday’s party. You , but why didn’t you?

A. should come

B. may come

C. ought to have come

D. may have come

答案：

A. should come

B. may come

(答案→)C. ought to have come

D. may have come

解析：考查情态动词+have done的用法，这句话是过去时，说明是对过去的事情的推测或是虚拟，AB都不对，C项ought to have done本应该做而没做，D项may have done过去可能做了，句意：昨天的聚会很有趣，你本应该去的，但为什么不去？选C。