--Did you listen to the speech?
--- No, we it. But we had a lot of traffic on our way.
A. could have attended
B. must have attended
C. could attend
D. shouldn't have attended
网友回答
(答案→)A. could have attended
B. must have attended
C. could attend
D. shouldn't have attended
解析：该题考查的是虚拟语气，表示“本能……”是与过去事实相反，要用could+have done形式。