Runners who often manage to win races do so not only because they_英语解答

Runners who often manage to win races do so not only because they are good at running.
这句话中 do so 是什么用法
我问的主要是so 的用法

人气：276 ℃　时间：2020-01-26 03:00:19

解答

so在此是指代的作用,前面应该还有东西吧,用so省略了前面提过的“做...”