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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 498

________ three years and a half since they began to build the great bridge.

A.It’s B.It was C.There is D.There are
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threeyearsandahalfsincetheybeg