These achievements_______ without the contribution of Qian Xuesen, a key leader of the New China's nuclear, missile and so on.


  1. A.
    would have been unthinkable
  2. B.
    would not be unthinkable
  3. C.
    would be unthinkable
  4. D.
    would not have been unthinkable
A
(本題考查虛擬語(yǔ)氣。題干句子中“without the contribution of Qian Xuesen”表示與過去事實(shí)相反的虛擬語(yǔ)氣,謂語(yǔ)動(dòng)詞要用“would(not)}lave done'’。)
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