— Did you go to the lecture by the visiting professor?— No. I it but I've been busy taki

问题补充：

— Did you go to the lecture by the visiting professor?

— No. I it, but Ive been busy taking care of my grandma in hospital these days.

A. would have attended

B. should attend

C. must have attended

D. would attend

答案：

(答案→)A. would have attended

B. should attend

C. must have attended

D. would attend

解析：句意：你去听访问教授的演讲了吗？--没有，我本来可以去听的，但是这几天我忙着照顾生病住院的奶奶。从but Ive been busy taking care of my grandma in hospital these days.可知是没有去，所以前面用和过去相反的虚拟语气，用would have done，选A。