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    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

    考查虚拟语气。题干句子中“without the contribution of Qian Xuesen”表示与过去事实相反的虚拟语气，谓语动词要用“would（not）have done'’。

     

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