The country has already sent up three unmanned spacecrafts. the most recent at the end of last Mar——青夏教育精英家教网—

摘要： 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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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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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

查看习题详情和答案>>

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