The Shenzhou wouldn’t have been sent up successfully _________ for the great efforts of many scientists．


  1. A.
    if it were not
  2. B.
    were it not
  3. C.
    had it not been
  4. D.
    it had not been
C
這是一個與過去事實相反的假設(shè)，在非真實的條件句中，可把if去掉，把had提到句首。
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