Question

—Tom graduated from college at a very young age.
—Oh,he__________have been a very smart boy then.

1. A.
   could
2. B.
   should
3. C.
   might
4. D.
   must

Answer 1

D
試題分析：考察情態(tài)動(dòng)詞用法。Could have done本可以做某事，實(shí)際上卻未做；should have done本應(yīng)該做某事，實(shí)際上卻為做；might have done也許做了某事；must have done一定做了某事；句意：—Tom很小的時(shí)候就大學(xué)畢業(yè)了�！���！他一定是一個(gè)很聰明的學(xué)生。根據(jù)句意說明D正確。
考點(diǎn)：考察情態(tài)動(dòng)詞用法
點(diǎn)評(píng)：本題是高考必考考點(diǎn)，一定要牢記句型意思。must have done過去肯定做了某事。should have done 本應(yīng)該做而實(shí)際未做。 can’t have done 過去不可能做了某事；shouldn’t have done 本不應(yīng)該做而實(shí)際做了。 need have done 本有必要做某事；needn’t have done 本沒有必要做某事；注意沒有 mustn’t have done的形式。