题目内容
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
B
解析:
略
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题目内容
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
B
略