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---Has Sam finished his homework today?

---I have no idea.He ________ it this morning.


  1. A.
    did
  2. B.
    has done
  3. C.
    was doing
  4. D.
    had done
C
此题语境设计非常精彩,句意是:“Sam做完作业了吗?”“我不知道。他今天早晨正在做。”本题考查的是过去某个时间正在做的事情,所以选择C项。
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