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
【答案】
B
【解析】
考查独立主格结构。launch和spacecraft之间为动宾关系,且动作已经发生,故用现在分词的被动完成式作逻辑谓语,构成独立主格结构。

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