Nowhere in nature is aluminum found

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

  • A.being combined
  • B.having combined
  • C.to combine
  • D.combined

参考答案:

A

【句意】 由于铝总是和其它元素结合在一起,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。