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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.
admin
2010-04-24
47
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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0
专业英语四级
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