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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
2010-03-19
58
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
句意:由于铝总是和其他元素结合在一起,最常见的是和氧气在一起,所以自然界中哪里也不会找到单独的铝元素。owing to是介词,后应接名词或动名词,根据题意,应接被动语态形式。
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0
专业英语四级
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