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

         A.would have been unthinkable B.would not be unthinkable

         C.would be unthinkable         D.would not have been unthinkable

A


解析:

(本題考查虛擬語氣。題干句子中“without the contribution of Qian Xuesen”表示與過去事實(shí)相反的虛擬語氣,謂語動(dòng)詞要用“would(not)}lave done'’。)

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