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英语选择题求解释为什么选a

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英语选择题求解释为什么选a
66.The University of California,_____ in 1868,is administrated by president and governed by a twenty-four-member board of regents.
A.founded B.has been founded C.to have been founded D.was founded
动词原形 过去式 过去分词
find(发现,找到) found found
found(建立,创建) founded founded
本题考查的是非谓语动词,并且答案A选项founded是过去分词,表示被动.即The University of California和found的关系是被动关系._____ in 1868,这部分是非谓语动词中的过去分词短语.founded in 1868这个过去分词短语在句子中相当于一个定语从句,即which(此句前面有逗号,不能用that) was founded in 1868,
定语从句可分为两大类,限制性定语从句和非限制性定语从句.两者很明显的区别就是非限制性定语从句前面有个逗号,除此之外,定语从句删掉句子不完整,意思发生改变;而非限制性定语从句是可以删掉的,不影响整个句子的完整,起补充说明的作用.
注意:非限制性定语从句一定不能用that用引导词,是不允许.
下面的都是正确的.
The University of California,founded in 1868,is administrated by ...
The University of California,which was founded in 1868,is administrated...
The University of California that was founded in 1868,is administrated...
The University of California which in 1868,is administrated by ...