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There are three thousand students in our school,_____are gir

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There are three thousand students in our school,_____are girls.
A.of whom two thirds B.two-thirds of them
请说明原因
There are three thousand students in our school,_____are gir
用了逗号,说明后面是从句,如果选B,逗号后面是一个完整的句子,不符合语法.A,whom在从句中指代them,构成从句
首先把B排除,以为two-thirds应该把s去掉,举个例子:一个八岁大的男孩
可以说an eight years old boy.也可以说,an eight-year old boy,当有横线的时候,后面是不能加s的,所以就选A了 赞同0
这是定语从句.介词+关系词作定语,可以放在所修饰的名词前.
正常的顺序是:two thirds of whom
也可为:of whom two thirds