一个句子改错题

1. 改成：This was the factory which you visited yesterday.

2. 解释：关系词代替先行词the factory在定语从句中做visited的宾语，所以用关系代词which，而不能用关系副词where.
因为：关系代词在定语从句中充当主语/宾语/表语/定语，而关系副词在定语从句中只充当时间/地点/原因状语。

即完整的定语从句为：you visited which(=the factory) yesterday.

而如果用where，表明该句缺少的是地点状语，比如写成：
you visited in the factory(where=in which) yesterday.
而上句明显是错误的。

感觉比较同意二楼的，但是不敢确定，所以赶快把答案改了。汗水！！

where 改成which，这是要求用一个宾语从句，而where不能引导。

把was改成is

This is the factory where you visited yesterday.

the factory 是从过去到现在都还存在的东西.