—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，應該用現(xiàn)在完成進行時�，F(xiàn)在完成進行時用于表示“從過去某一時刻開始的動作一直持續(xù)到現(xiàn)在，并且還要繼續(xù)下去”。而現(xiàn)在完成時表示過去發(fā)生的動作對現(xiàn)在造成的影響好結果。因此，D正確。
考點: 考查動詞時態(tài)的用法。
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