题目内容
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
B
解析:
略
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题目内容
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
B
略