—She looks very happy.She_______have passed the exam.
—I guess so.It’s not difficult after all.
A.shouldB.couldC.mustD.might
C
“must have+動(dòng)詞-ed形式”表示“一定做了某事”,根據(jù)所提供的情景“She looks very happy.”可判斷出她一定通過(guò)了考試。“should have+動(dòng)詞-ed形式”表示“本來(lái)應(yīng)該做某事,而沒(méi)有做”,常用于表示責(zé)備。“could have+動(dòng)詞-ed形式”在肯定句型中,往往用作委婉地批評(píng),表示本應(yīng)該做什么,而沒(méi)做,有時(shí)也用作猜測(cè)!癿ight have+動(dòng)詞-ed形式”表示推測(cè)過(guò)去做過(guò)某事,“也許”發(fā)生了。
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