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 launchedB.having been launched
C.being launchedD.to be launched
题型:单选题难度:中档来源:不详

答案

B
the most recent having been launched构成独立主格结构。the most recent指最近发射的载人飞船,与launch是被动关系所以要用动词+ing形式的完成式的被动式。

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