---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
此題語境設(shè)計非常精彩，句意是：“Sam做完作業(yè)了嗎?”“我不知道。他今天早晨正在做�！北绢}考查的是過去某個時間正在做的事情，所以選擇C項。
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