Nowhere in nature is aluminum found free, owing to its always （） with other elements, most commonly with oxygen ( 章节：1 难度：3)
- A、being combined
- B、having combined
- C、to combine
- D、combined
正确答案:A
答案解析:有
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Nowhere in nature is aluminum found free, owing to its always （） with other elements, most commonly with oxygen ( 章节：1 难度：3)
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