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【单选题】

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
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根据网考网移动考试中心的统计，该试题：

83%的考友选择了A选项

12%的考友选择了B选项

4%的考友选择了C选项

1%的考友选择了D选项

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