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:
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。