The real-name system train tickets will be sold based on real names is aimed to fight ticket-scalping, which has long been a headache for Chinese travelers.
A. which
B. that
C. from which
D. in which
网友回答
A. which
B. that
C. from which
(答案→)D. in which
解析：考查定语从句关系词的选择。根据句子结构可知，该句为定语从句，先行词system在定语从句中从当状语，故选择where=in which 意为在这项实名制的系统中