因为 分句已经有了主语 roof,所以 roof是从属于house,应该用whose.
如果要选 of which,句子就变成了 Look out!Don't get too close to the house, roof of which is under repair.
因为 分句已经有了主语 roof,所以 roof是从属于house,应该用whose.
如果要选 of which,句子就变成了 Look out!Don't get too close to the house, roof of which is under repair.