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The country has already sent up three unmanned spacecraft, the most recent__at the end of last March
题目简介
The country has already sent up three unmanned spacecraft, the most recent__at the end of last March
题目详情
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
题型：单选题难度：偏易来源：不详
答案
B
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。
题目简介
The country has already sent up three unmanned spacecraft, the most recent__at the end of last March
题目详情
答案
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。