题目内容：

Is this factory () you visit lasted year?
which the one where 的区别

优质解答

这题目只能选the one
is this factory_____ you visited...
改成陈述句是This factory is ______ you visited.
定语从句前没有先行词, 必需用the one= the factory, 充当先行词.

追问：

那什么时候用which呢

追答：

Is this the factory... +个the就用which了