Question

－Hi, Jack! Have you heard of any good news about Frank recently?

－Yeah．He ________ have done better．He has been admitted to Beijing University because of his winning the prize in the national computer contest．

[　　]

A．shouldn't

B．wouldn't

C．needn't

D．couldn't

Answer 1

答案：D
解析：

考查情态动词的用法。根据句意可知此处是表示能力，could have done：本来有能力做某事。本题用否定的比较级表示最高级的意思，意思为他已经取得了最好的成绩。shouldn't have done的意思为本来不该做某事而实际上做了；needn't have done本不需要做某事；wouldn't have done本不会做某事。