The country has already sent up three unmanned spacecraft, the most recent ______ at the end of last March.

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问题 The country has already sent up three unmanned spacecraft, the most recent ______ at the end of last March.

选项 A、has been launched
B、having been launched
C、being launched
D、to be launched

答案B

解析 分析句子结构,此处考查独立主格结构。the most recent是独立分词结构的逻辑主语,指“最近的无人宇宙飞船”,与launch之间为动宾关系,因此用被动语态。又由独立分词结构中的时间状语“at the end of last March”可知,动作已经完成,故用分词结构的被动完成时,选B。
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