非限制性定语从句要看先行词,这句话里先行词是the man,是指人,那么只能用who/whom,只有可能是这两种,which是表示物的,比如说my father give me a book,which is very thick.which修饰书,属于物,那么才用which.
A也不选,横线的词在从句中充当的是主语成分,因此要用who,如果句子换成：people stood around the man,___ was been hit by the car.
就该用whom了,因为此时whom用作宾语了,whom只能用作宾语.我有个小秘诀,以后做选择who和whom的题目,就选who,因为who具备了所有whom具有的功能.