Nowhere in nature is aluminum found free, owing to it always ______ with other e

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问题 Nowhere in nature is aluminum found free, owing to it always ______ with other elements, most commonly with oxygen.

选项 A、being combined
B、having combined
C、to combine
D、combined

答案 A

解析非谓语动词题。owing to是介词，后应接名词或动名词，所以排除选项C 和D 。而根据题意，后面应该接被动语态形式，进而排除选项B 。

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