题目内容
17、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
试题答案
17、B
相关题目
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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