2. 考研
  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、combined
B、having combined
C、combine
D、being combined
答案D
解析 本题考查对非谓语动词的掌握。从句中的词组owing to和所有格形式its来看，后边应该接名词。而根据题意这里的动名词应该是被动形式，表示状态，而不是完成式的动名词的主动形式，因此只有选项being combined为正确答案。
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考研英语一

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