Question

My sister met him at the Grand Theatre yesterday afternoon，so he ________ your lecture.

A．couldn't have attended B．needn't have attended

C．mustn't have attended D．shouldn't have attended

 

Answer 1

A

【解析】

“情态动词＋完成式”有各自的含义。must have done表示对过去事情的肯定推测，多用于肯定句中；needn't have done表示过去本不必做的事情；shouldn't have done表示过去做了不该做的事情；can't(couldn't)have done表示对过去的否定性推测，意为“不可能”。所提供的情境My sister met him at the Grand表示他不可能参加讲座。