Aluminum(铝) remained unknown until the 19th century,because nowhere in nature is it found free,owing to its always being combined with other elements,most commonly with oxygen,for which it has a strong affinity.(亲和力)
最后一句为什么不直接for it has...变成原因状语从句,而要加个which呢? 就算保留which,使其为定语从句,为什么还需要it呢?which和it不都指的是oxygen吗,不懂
你有二处理解错误。第一,本句中的it始终指代Aluminum,不是指代oxygen。第二,for不是表示原因的并列连词,而是介词,是affinity要求搭配的介词,即 Aluminum has a strong affinity for oxygen. which指代oxygen,并作介词for的宾语,前置引导从句,就得到 for which it has a strong affinity. 这是修饰oxygen的非限制性定语从句。
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