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

解析试题分析:考查独立主格结构:句意:这个国家已经发射了三颗无人飞船,最近的在去年三月份被发射。句中没有连接词,故不能选作谓语动词的A项;由at the end of last March可知应选用表示动作完成the most recent having been launched为独立主格结构,选B项。
考点:考查独立主格结构

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