There were 28 students in my class,which is about the average size for British.为什么which不可改为that?

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There were 28 students in my class,which is about the average size for British.为什么which不可改为that?
There were 28 students in my class,which is about the average size for British.为什么which不可改为
that?

There were 28 students in my class,which is about the average size for British.为什么which不可改为that?
用,号割开的定从,叫非限制性定语从句,that不引导非限制性从句

非限制性定语从句用which

which 指代的是前面一整句话。所以不能改为that

因为前面用逗号隔开了

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