--Did you listen to the speech?--- No we it. But we had a lot of traffic on our way.A. c

问题补充：

--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 have attended

答案：

(答案→)A. could have attended

B. must have attended

C. could attend

D. shouldn 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。