题目内容
The country's railway system has launched online ticket-booking and a real-name ticket purchasing system, and _______ requires passengers to provide their ID numbers when buying tickets.
A. whichB. thatC. whatD. this
【答案】
B
【解析】
本题考查代词。题干中and已是连词,不要其它连词。此处that是代词,用来指代前面句子的内容。
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