新概念3第九课的问题The radio would signal the rate at which the ball

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新概念3第九课的问题
The radio would signal the rate at which the ball was slowed down and scientists would be able to calculate hoe dence the atmosphere is .
这句话中,“the ball was slowed down ”是虚拟语气的用法吗?
可那篇文章描写的好像都是将来时态的内容。开篇第一句是“By now,a rocket will have set off on its thirty million mile trip to Mars.”
如果是虚拟语气，那这个又是虚拟语气的哪种用法？

肯定不是虚拟语气!回答要负责任的!
这是一个定语从句里面的一般过去时态的被动语态.
补充:
这不是什么虚拟语气,你现在还没明白吗?一楼简直误人子弟!你是听他一个字,还是听我好好给你说?
你给出的句子:
The radio would signal the rate at which the ball was slowed down and scientists would be able to calculate hoe dence the atmosphere is .
在这个句子里,用的都是过去时,所以你不要看全篇讲的什么时态,也许这里是讲的过去的情况. 两个would就说明了这一点.
个别的句子和整篇文章的时态没有什么必然联系.你想想,如果你写将来火箭发射到火星,你是不是也会写之前科学家们的努力呢?这时候就是过去时了.
希望你现在理解了.

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