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  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、combine
B、combined
C、being combined
D、having combined
答案C
解析 owing to是介语短语，后面应跟名词或动名词，its being combined with other ele-ments为动名词短语。其他三个选择答案不合适，因为combine为动词原形；combined为过去分词；having combined为主动态。
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