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 解析:the most recent前没有连词.说明后面不是一个句子.因而该题考查独立主格结构.根据题干中提供的时间判断.最近的spacecraft已经被发射.用现在分词完成式的被动式.所以选择B. 【查看更多】

 

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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

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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

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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

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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

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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

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