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  • 科目:英语
  • 题型:单选题
  • 难度:较易
  • 人气:1617

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
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Thecountrysrailwaysystemhaslau