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.which B.that C.what D.this 

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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