问题描述:
[-A69] 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
翻译并分析
end of last March.
A.has been launched
B.having been launched
C.being launched
D.to be launched
翻译并分析
问题解答:
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