— Hi, Tracy, you look tired. — I ________&n

— Hi, Tracy, you look tired. — I ________ the living room for three hours.A.paintedB.had paintedC.was paintingD.have been painting

D解析考察时态。根据时间状语for three hours和句意：Tracy，你好，你看上去很累。这三个小时来我一直在粉刷起居室。现在完成进行时强调动作的持续性和反复性。故D正确。

谢谢了