paris is second oldest,in which it was opened in the year 1900.

问题描述:

paris is second oldest,in which it was opened in the year 1900.
忘了说前提 再说地铁 前文说london 最早修的地铁,接下来说的paris 但是关键是这个句子我理解不了语法。

巴黎是第二古老的,它于1900年在那里开放.