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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1429

By the middle of the 21st century, the vast majority of the world's population __________ in cities rather than in the country.

A.are living
B.will be living
C.have lived
D.will have lived
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Bythemiddleofthe21stcentury,th