The factory decided to repair those houses, ____ had been already broken.
为什么填 whose roofs
The factory decided to repair those houses, ____ had been already broken.
为什么填 whose roofs
定语从句, whose roofs修饰前面的 houses,这些屋子的屋顶已坏了
这句是 非限制性定语从句
句子意思是:他们决定修缮那些房子,那些屋顶已经坏掉的。
whose 是先行词 代替those houses 因为roofs 和 those houses 是一个部分与整体的关系 所以要用whose 而不能用who