there are 30 volunteers,many of whom come from a university.为什么不用which,that,who

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thereare30volunteers,manyofwhomcomefromauniversity.为什么不用which,that,whothereare30volunteers,manyofwho

there are 30 volunteers,many of whom come from a university.为什么不用which,that,who
there are 30 volunteers,many of whom come from a university.
为什么不用which,that,who

there are 30 volunteers,many of whom come from a university.为什么不用which,that,who
这是定语从句,先行词是volunteers,志愿者是人,所以应该用可以指代人的引导词,所以which不对.而定语从句用that的条件是从句中不缺成分.很明显,从句中come from a university没有主语,它缺主语成分,所以不对.
many of ,许多的.其中of是介词,后面接人的时候接宾格,本应该说成many of them,who用于主格,whom用于宾格,所以是whom

这句话的意思:有30名志愿者,他们大多来自于一所大学.

这个定语从句的先行词volunteers是人, 而which,that指物,首先排除.

又在介词后作介宾只能用宾格,而不能用主格.因此不能用who.