— Did you go to the lecture by the visiting professor?
— No. I it, but I've 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
网友回答
(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 I've 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。