关于定语从句的两个句子

问题描述:

关于定语从句的两个句子
I was given three books on cooking ,the first (of which)I really enjoyed.
When people talk about the places of interest in China,the first (that) comes into mind is the Summer Palace.
为什么第一句用of which,而第二句用that?

第一句是定语从句,先行词是three books,the first of which指三本书中的第一本
第二句是定语从句,先行词the first.当先行词是序数词时,关系词只能用that
the first 可数名词,表示第一个人或事物
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