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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
  • 浏览 1625

The country has already sent up three unmanned spacecraft, the most recent __________ at the end of last March.

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