判断用whom 还是 them 填空

用whom还是them? 这题用whom还是them? 一道选择填空题：用whom还是who?为什么? 定语从句 用 介词+whom/which 填空 用that,who,whom,whose,which填空 用that who whom which 填空 用介词+关系代词whom/which填空 (用"介词+关系代词whom/which"填空) 用who,whom,that,which填空 用who whom that which 填空 用that,which,who,whose,whom填空 用that which who whom填空