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