--- 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
D
考察時態(tài)。根據(jù)時間狀語for three hours和句意：—Tracy，你好，你看上去很累�！@三個小時來我一直在粉刷起居室�，F(xiàn)在完成進(jìn)行時強(qiáng)調(diào)動作的持續(xù)性和反復(fù)性。故D正確。
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