Nowhere in nature is aluminum found free, owing to its always ______ with other

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问题 Nowhere in nature is aluminum found free, owing to its always ______ with other elements, most commonly with oxygen.

选项 A、being combined
B、having combined
C、to combine
D、combined

答案 A

解析句意：由于铝总是和其他元素结合在一起，最常见的是和氧气在一起，所以自然界中哪里也不会找到单独的铝元素。owing to是介词，后应接名词或动名词，根据题意，应接被动语态形式。

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