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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 2106

China ______ a lot of people moving to urban areas in the last 20 years. However, many migrants  left their families behind.

A.saw B.sees C.has seen D.had seen
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