我见过定语从句中用from which的用法。如下面的句子（从资料上抄的）： This is the book from which I got the story. 这就是那本书，从中我读到这个故事。 Where is the book from which you quoted this sentence? 你引用这句话的那本书在哪儿？ Cotton and wool are raw materials from which cloth is made. 棉花和羊毛是制衣的原料。 Milk from which the cream has been taken is called skim-milk. 被提取出奶油的牛奶叫脱脂乳。 但定语从句可以用from whose来引导吗？再问一下，如果定语从句可以用from whose来引导，那它与from which有什么呢？是因为whose可以作定语吗？但是，别忘了，which也可以作定语的。虽然没有找到which引导定语从句时作定语的例子，但从理论上应该是可以的，对吗？请专家分析分析，非常感谢！
