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”表示與過去事實相反的虛擬語氣，謂語動詞要用“would（not）}lave done'’。

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