-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 puter contest．A.shouldn'tB.wouldn'tC.needn'tD.couldn't
网友回答
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。