Is that factory which your father once worked in?改错的题目,不知其解,那么,请．望附有解析,

句意为：那家工厂是你爸爸曾经工作过的地方吗？
改为陈述句是：That is the factory which your father once worked in.
你到底要问什么呀？你这一句好象有错，that 后面加一个the 吧。

Is that the factory which your father once worked in?不加定冠词句子会少了先行词。

Is that (the) factory which your father once worked in?
Is that factory (the one that) your father once worked in?
Is that factory where your father once worked?

Is that (the) factory which ur father once worked in.
加定冠词