【題目】－When I first got to Harvard, my terrible English was a burden to me.

－Oh, dear, it ________ a struggle for you to keep up with other students.

A. might be B. can be

C. should have been D. must have been

【答案】D

【解析】

試題分析：考查情態(tài)動詞�！扒閼B(tài)動詞+have done”的形式既可以表示虛擬語氣，也可以表示對過去情況的推測。如：must have done過去肯定做了某事。should have done 本應該做而實際未做。 can’t have done 過去不可能做了某事；shouldn’t have done 本不應該做而實際做了。 need have done 本有必要做某事；needn’t have done 本沒有必要做某事；句意：—當我最初來打哈佛的時候，糟糕的英語對我來說是一個很大的負擔�！獙δ銇碚f跟上其他學生一定是一個很困難的事情吧！本句是對過去所發(fā)生事情的肯定推測。所以D項正確。

【高考再現(xiàn)】

(13上海)It_____ have been Tom that parked the car here, as he is the only one with a car.

A. may B. can C. must D. should

〖答案〗C

〖解析〗通過意思我們知道是表示可能的推測, 而且是過去的可能, 表達的是一定是….比較肯定的推測, 所以我們用must have done 的形式。

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