◎ 题干
Nowhere in nature is aluminium (铝) found free, owing to (由于) its always  ____with other
elements (元素) most commonly with oxygen.  
[     ]
A. combined    
B. having combined 
C. combine    
D. being combined
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Nowhere in nature is aluminium (铝) found free, owing to (由于) its always____with other elements (元素) most commonly with oxygen.[ ]A. combinedB. having com…”主要考查了你对  【动名词的被动式】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。