一道定语从句Itwasinthestreet()ImetJohnyesterday.这到题的答案是”that",为什么不是"which"?能详细解析一下吗?

Question

一道定语从句
It was in the street( )I met John yesterday.
这到题的答案是”that",为什么不是"which"?
能详细解析一下吗?

Answer 1

这里的that I met John yesterday不是定语从句,that是跟前面强调句在一起的固定结构“It was in the street that”,后面加的是解释it的句子,it是先行词
也就是说,这句话其实就是“That I met John yesterday was in the street.”