The real-name policy for train tickets has been applied to all trains since January l, 2012 in China, will make it easy for people to get tickets.
A. which
B. when
C. what
D. Where
网友回答
(答案→)A. which
B. when
C. what
D. Where
解析：考查定语从句。根据横线前的逗号可知，是非限制性定语从句，what不能引导定语从句，排除C；定语从句缺少主语，这里指代“火车票实名制”这件事，用which。故选A。