There are many people downstairs. What do you think _____?
A.to happenB.happening
C.is happenedD.has happened
D
試題分析:現(xiàn)在完成時(shí)用來表示之前已發(fā)生或完成的動(dòng)作或狀態(tài),其結(jié)果的確和現(xiàn)在有聯(lián)系。動(dòng)作或狀態(tài)發(fā)生在過去 但它的影響現(xiàn)在還存在;也可表示持續(xù)到現(xiàn)在的動(dòng)作或 狀態(tài)。其構(gòu)成: have (has) +過去分詞。根據(jù)語境可知此句的含義是樓下有很多的人,你認(rèn)為發(fā)生什么事情了,因主語是what, do you think是插入語,故用助動(dòng)詞has not+過去分詞,故選D.

點(diǎn)評(píng): 注意現(xiàn)在完成時(shí)和一般過去時(shí)兩種時(shí)態(tài)的區(qū)分
(1)一般過去時(shí)的謂語動(dòng)詞用過去式,而現(xiàn)在完成時(shí)的謂語基本構(gòu)成是"助動(dòng)詞have /has +過去分詞"。 (2)一般過去時(shí)通常與表示過去的時(shí)間狀語連用。如:yesterday, last week, two years ago, just now, in 2002等; 而現(xiàn)在完成時(shí)則常與just, already, ever, never等副詞和these days, this week, since..., for...等表示一段時(shí)間的狀語連用。
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