2. 外语
  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、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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