这个句子里which为什么不能用where代替?

题目

这个句子里which为什么不能用where代替?
we went to the national book fair yesterday,which was crowded with visitors from all over the world.

答案

当定语从句后面紧跟动词时,when和where就要用that或者which代替,如At the end of the street,where shoppers crowded.(这儿可以用where)At the end of the street,which narrowed sharply.(这儿不能 用where代替,因...