would have done表示对过去动作的的推测或者虚拟
可以根据事件发生的逻辑顺序推测出来.
我想这里不是虚拟语气,应该是过去将来完成时
因为陨石撞击地球已经完成了,并且是过去发生的.
would have done 用法
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