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问一道SAT语法题Most major air pollutants cannot be seen,although l

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问一道SAT语法题
Most major air pollutants cannot be seen,although large amounts of them concentrated in cities are visible as smog.No error.这句话为什么是NO ERROR,明明concentrated on 怎么会用介词in
concentrated是过去分词作定语,修饰前面的them; in cities 在城市;此处的 in 不是与 concentrated 连用,而是与 cities 连用的.