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20.The Group of Eight ______ by eight of the world's wealthiest nations in 1998.(  )
A.was formedB.formsC.is formedD.formed

分析 八国集团是由八个世界最富有的国家在1998组成.

解答 答案是A.考查被动语态,分析句子可知The Group of Eight 是主语,form动词"组成"与主语形成被动关系,1998年是过去时间,所以用一般过去时的被动语态,故答案选A.

点评 被动语态由"助动词be+及物动词的过去分词"构成.被动语态的时态变化只改变be的形式,过去分词部分不变.疑问式和否定式的变化也如此.掌握各种时态的被动语态是解题的关键.

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