where 在定语从句中的用法跟that的区别

题目

where 在定语从句中的用法跟that的区别
我是刚中考完的学生,正在看高一的英语教材.
书里面有关于定语从句的知识初中的老师曾经有讲过,当时概念还算清楚
有这两句话：
This is the hospital where my mother works.
This is the hospital which / that we spent together in Xueyao Middle School.
两句话中分别用where和which / that ,我有点搞不懂,这两个词有什么区别,
不好意思,第二句输错了...
This is the hospital which/that we visited the day before yesterday.

答案