Question

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

Answer 1

A

（本题考查虚拟语气。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）}lave done'’。）