in the city in which 语法对吗?

看具体的句子才能判断。不过这种说法是可以的。如：Last year I lived in the city in which my parents worked twenty years ago。去年我住在我爸妈二十年前所工作过的那个城市。其中定语从句：(in which) my parents worked twenty years ago= (where) my parents worked twenty years ago= my parents worked (in which) twenty years ago = my parents worked (in the city) twenty years ago