这个句子中的where引导了定语从句,且where做从句的表语.因前面动词是系动词be.
定语从句是一不完整的句子.因为先行词被提到前面.所以引导词在从句中做成份.根据先行词在从句的成份来选择相应的关系词来引导定语从句.如
The book that/which I bought is very interesting .(先行词做宾语用关系代词引导)
This is the city where my father worked last year.（先行词做状语用关系副词引导）
This is the city that /which my father visited last year.（做宾语用代词引导）