I ________ for three hours when I suddenly became sick.


  1. A.
    had been working
  2. B.
    would work
  3. C.
    have worked
  4. D.
    am working
A
句意是“我一直工作了三小時(shí),這時(shí)我突然覺得不舒服”。此處要用過去進(jìn)行時(shí)表示到過去某個(gè)時(shí)間為止一直持續(xù)的狀態(tài)。
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