---Did you listen to the speech?
---No.We_______ it,but we had lots of traffic on the way.
A.could have attended
B.must have attended
C.didn't attend
D.hadn't attended
应选：A
译文：你有去听演讲吗?
没有,我们本来是能够出席演讲的,但是我们在路上遇到了大堵塞.
解析：本题是对 虚拟语气 的考察,could have done 本能够,表示对过去情况一种可能的推测