第二个that指代什么

问题描述:

第二个that指代什么
a role that a home plays in a overall development of a child is more crucial than that of a school.如题,第二个that代指什么?如果我想写类似这样省略的句子,怎么构造that of...之类的?

代指“a role that a home plays in a overall development”
that之后不一定要用of,要根据句子结构看
而且,这个句子重点强调的不是省略,而是比较级中代词的用法,就是说比较级中代词一定用that,而不用it ,one,ones等等