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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1606

The country has already sent up three unmanned spacecrafts, the most recent ____at the end of last March.

A.to be launched B.launched
C.being launched D.has been launched
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Thecountryhasalreadysentupthre