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  • 科目:英语
  • 题型:单选题
  • 难度:较易
  • 人气:223

The country has already sent up three unmanned spacecrafts, 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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Thecountryhasalreadysentupthre