一道高考英语单选I was told that there were adout 50 foreign students

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一道高考英语单选I was told that there were adout 50 foreign students
2006辽宁高考英语选择题:I was told that there were adout 50 foreign students----Chinese in the school,most---were from Germany.A study,of whom     B study,of them   C studying,of them    Dstudying,of whom为什么第二空用of whom不用of who?因为介词of吗?应该也可以用of which吧,我知道不用of them