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19.Aluminum isn't found free in nature,owing to its always ______ with other elements,most commonly with oxygen. (  )
A.being combinedB.having combinedC.combineD.combined

分析 在自然界中发现的铝不是独立存在的,因为铝和其它元素结合在一起,通常情况下是和氧在一起.

解答 答案是A.本题考查动名词的被动语态;题干中owing to中的to是介词,故它的后面应跟动名词,这里是its+动名词也就是动名词的复合结构.combine …with…与…结合;可见及物动词combine后缺少宾语,its与combine之间是被动关系,故用being combined,故选A.

点评 首先判断选项中的动词在句中是以谓语还是非谓语形式出现,然后根据选项在句中的功能结合非谓语的基本用法做出合理的判断.要关注常见非谓语动词的搭配.

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