很高興為您
my maths teacher gave the textbook to all the students except()who had already taken them
答案：A
定語從句需要先行詞來引導(dǎo),從句中缺少的成分是主語,先行詞就是the ones,特指的是the pupils,因?yàn)楫?dāng)有后置定語從句修飾名詞時(shí),該名詞要用特指.比如the map of China,the girl who wears a hat.
ones表示泛指
some不是名詞,不能做先行詞
the others指"另外的",經(jīng)常與one搭配,通常用法是"one...the others",
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-------------------------------some為什么不可以？這里的代詞是表示特指（而some是泛指）