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语法问题Since1971theregionalcorprationssetupinAlaskabycongresshavemanagedeverythingfromfishingtobanking.havemanaged是谓语,那setup就是定语,但它修饰的是主语为什么可以省去whichare

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语法问题
Since 1971 the regional corprations set up in Alaska by congress have managed everything from fishing to banking.
have managed 是谓语,那set up 就是定语,但它修饰的是主语为什么可以省去which are
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答案和解析
这是过去分词做后置定语.因为the regional corprations 与set up 是被动的,就用set up 的过去分词来修饰他.其功能和定语从句是一样的.比如:中国制造的车:the car which was made in China= the car made in China ...