Question

 I ______ to my cousin^’s birthday party last night, but I was not available

A. went                   B. had gone            C. would go           D. would have gone

Answer 1

 D。本题考查虚拟语气。本题的解题关键是逗号之后的句子“but I was not available”，由此可以看出，昨晚的聚会我没有参加，所以空处是与过去事实相反的动作，故正确答案是would have gone。

【拓展】与过去事实相反的动作，从句用had done, 主句用would/should/could/might do的形式。

【句意】昨晚我本来要去参加表哥的生日聚会，但我没空。