Question

“ They went to the lecture, but it had been put off.” “ Oh, so they _______.”

A．needn’t have gone                     B．should have gone

C．mustn’t have gone                     D．don’t need to go

Answer

A

【解析】

试题分析：考查情态动词用法。Needn’t have done本不需要做某事，实际上却做了；should have done本应该做某事，实际上却未做；不存在mustn’t have done的形式。Don’t need to do sth不必做某事；句意：他们去听讲座了，但是讲座被推迟了。他们本不需要去的。根据句意说明A正确。

考点：考查情态动词用法