◎ 题干
China's railway system has carried out a real-name ticket purchasing system, _____ requires
passengers to provide their ID numbers when buying tickets.
[     ]
A. in which        
B. whose            
C. who              
D. which
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“China's railway system has carried out a real-name ticket purchasing system, _____ requirespassengers to provide their ID numbers when buying tickets. [ ]A. i…”主要考查了你对  【关系代词】【非限制性定语从句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。