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?

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