—Why is the house in a mess?
—I         it for Christmas since three days ago.
A.cleanedB.cleans
C.have cleanedD.have been cleaning
D

試題分析:句意:--為什么房子那么亂?--為了圣誕節(jié)我已經(jīng)打掃三天了。由題干上下文中可知,“我已打掃三天了”,但是還沒有打掃完,還要繼續(xù)打掃,應(yīng)該用現(xiàn)在完成進(jìn)行時(shí),F(xiàn)在完成進(jìn)行時(shí)用于表示“從過去某一時(shí)刻開始的動(dòng)作一直持續(xù)到現(xiàn)在,并且還要繼續(xù)下去”。而現(xiàn)在完成時(shí)表示過去發(fā)生的動(dòng)作對(duì)現(xiàn)在造成的影響好結(jié)果。因此,D正確。
考點(diǎn): 考查動(dòng)詞時(shí)態(tài)的用法。
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