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

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Nowhere in nature is aluminum found free,owing to its always __ with other elements,most commonly with oxygen.
a.combined
b.being combined
选哪个,为什么
/>因为its后面应该加名词性质的词,combined是形容词性,being combined 把combine名词化了
铝在自然界里无处不在,因为它往往和其他元素共存,尤其是氧.