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一个英语问题IthinkIhadatleastabilliontests,(including)oneinwhichtheycutoutapieceofmusclefrommylegandlookedatitunderamicroscope.括号里的单词为什么要用ing形式?用ed形式可不可以?

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一个英语问题
I think I had at least a billion tests,(including) one in which they cut out a piece of muscle from my leg and looked at it under a microscope.括号里的单词为什么要用ing形式?用ed形式可不可以?
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答案和解析
现在分词作定语.“许多考试”与“这一个考试”之间是主动,而非被动的关系.主动的话是现在分词;被动的话就用ed 形式.
eg.
There are so many people here,inluding teachers and students.
There are so many people here,teachers and students included.