I to my cousin’s birthday party last night but I was not availableA. wentB. had goneC

问题补充：

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

A. went

B. had gone

Cwould go

D. would have gone

答案：

A. went

B. had gone

C. would go

(答案→)D. would have gone

解析：考查虚拟语气：句意：昨晚我本来会去参见我的表弟的生日聚会的，但是我没有空。从后面的but I was not available可知事实是没有去： “would+have+done” 表示对过去事情的假设，意思是“本来会做”。结合语境可知选D。