Question

— Hi, Tracy, you look tired. 

— I ________ the living room for three hours.

1. A.
   painted
2. B.
   had painted
3. C.
   was painting
4. D.
   have been painting

Answer 1

D
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。