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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1252

In the past half-century, average incomes _______ quickly in developed countries, yet happiness levels have remained almost the same.

A.have risen B.had risen C.rose D.rise
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Inthepasthalfcentury,averagein