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单选

What is the cause of the increasing popularity of vending machines in Japan?

  • A.The increase of immigrants.
  • B.The love for advanced technology.
  • C.The shortage of low-wage labourers.
  • D.The low cost of making vending machines.
试题出自试卷《2017年10月全国自主考试综合英语(一)真题及答案》
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