划分英文句子成分-句子

摘要

Aluminum (主语)remained (系动词)unknow(表语) until the nieenth century(时间状语),because nowhere in nature is it found free,(原因状语)owing to its always being bined with other elements(原因状语),most monly with oxygen(方式状语),with which it has a strong affinity.(定语从句)