— We were all missing you at the party!
— Sorry. I was busy with my project research. Otherwise, I it.
A. attended
B. would attend
C. had attended
D. would have attended
网友回答
A. attended
B. would attend
C. had attended
(答案→)D. would have attended
解析：考查虚拟语气。根据语境可知为对过去事实相反的虚拟语气，故用would have done，选D。