A sports center has been built in what used to be a factory.为什么这里的what不用改呢?怎么会用what,它做什么成分?A small market has given way to a supermarket,next to that is a modern library.这里把that改成which ,这句也算

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A sports center has been built in what used to be a factory.为什么这里的what不用改呢?怎么会用what,它做什么成分?A small market has given way to a supermarket,next to that is a modern library.这里把that改成which ,这句也算

A sports center has been built in what used to be a factory.为什么这里的what不用改呢?怎么会用what,它做什么成分?A small market has given way to a supermarket,next to that is a modern library.这里把that改成which ,这句也算
A sports center has been built in what used to be a factory.
为什么这里的what不用改呢?怎么会用what,它做什么成分?
A small market has given way to a supermarket,next to that is a modern library.
这里把that改成which ,这句也算是费限制性定语从句是吗?

A sports center has been built in what used to be a factory.为什么这里的what不用改呢?怎么会用what,它做什么成分?A small market has given way to a supermarket,next to that is a modern library.这里把that改成which ,这句也算
第一句是状语从句,所谓状语从句,即在句子中间充当状语成分,去掉后面的内容A sports center has been built ,这个运动中心建在哪里呢?就是建在原来是一个工厂的地方,这里也可以用where,即where=in /at/on what.
第二句是定语从句,而且是非限制性定语从句,因为有逗号在前,改为which的原因是that不能用于介词后,而which可以.
可能你有些混淆,建议你看一下定语从句和状语从句的区别,看语法书吧,薄冰语法就很好,

in what 相当于 where ,where 指代那个sport center.
下面那段话是非限制性定语从句