2. 外语
  3. Nowhere in nature is aluminum found free, owing to its always ______with other elements, most commonly with oxygen.

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

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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、combined
C、to combine
D、having combined
答案A
解析
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