You late for yesterday’s class meeting, as it was so important.
A. couldn’t
B. shouldn’t be
C. mustn’t have been
D. oughtn’t to have been
网友回答
A. couldn’t
B. shouldn’t be
C. mustn’t have been
(答案→)D. oughtn’t to have been
解析：考查情态动词。oughtn’t to have done = shouldn’t have done本不应当做。句意：你昨天班会本应当迟到，因为它很重要。