—Did you attend the opening ceremony of The Voice of China last week?
—Sorry! We it, but we had a terrible traffic accident on our way.
A. must have attended
B. must attend
C. could have attended
D. could attend
网友回答
A. must have attended
B. must attend
(答案→)C. could have attended
D. could attend
解析：
试题分析:句意：——你参加了上周中国好声音的开幕式了吗？——真遗憾！我们本来有可能参加的，但是在路上遇到了严重的交通事故。从did和had判断句子是对过去发生事情的推测，排除BD选项；must have done “肯定做过某事”；could have done “本来有可能做某事”，答案选C。