这样的定语从句有5种表达：
1.Great changes have taken place in the city （in which） I was born.
2.Great changes have taken place in the city （ where ） I was born.
3.Great changes have taken place in the city （ which ） I was born （in）.
4.Great changes have taken place in the city （ that ） I was born （in）
5.Great changes have taken place in the city （ 不填 ） I was born （in）（作宾语的关系代词可以省略）