问题补充:
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
答案:
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。