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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1301

To his mind, the collaborative development of Beijing, Tianjin and Hebei province is to solve the problems _____ Beijing faces, such as overpopulation, traffic jams, and etc.

A.that B.whether C.when D.why
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Tohismind,thecollaborativedeve