摘要: 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.

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