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(gè)與過去事實(shí)相反的假設(shè)，在非真實(shí)的條件句中，可把if去掉，把had提到句首。
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