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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:1078

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
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Theseachievementswithoutthecon