Question

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

Answer 1

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。