问题
选择题
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
答案：D
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。