They have made much progress_____ their hard work

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They have made much progress_____ their hard work
A.through B.in C.with D.by

第一时间为你提供正确答案：
A
through hard work 通过努力工作
再问： by 和 with 不也行吗为什么不选它们
再答：这里表示通过，with没有这种意思
by, 后一般跟doing sth 来表示通过
所以这里用through
再问： with不是也有用的意思吗为什么不行呢
而且with也是加名词的啊
再答：其实这是一种固定搭配，
通过努力工作
through hard work
再问：谢谢了以后有问题再找你
再答：麻烦采纳一下

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