my maths teacher gave the textbook to all the students excep

很高兴为您
my maths teacher gave the textbook to all the students except()who had already taken them
答案：A
定语从句需要先行词来引导,从句中缺少的成分是主语,先行词就是the ones,特指的是the pupils,因为当有后置定语从句修饰名词时,该名词要用特指.比如the map of China,the girl who wears a hat.
ones表示泛指
some不是名词,不能做先行词
the others指"另外的",经常与one搭配,通常用法是"one...the others",
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再问： some为什么不可以？
再答： 这里的代词是表示特指（而some是泛指）