The country has already sent up three unmanned spacecraft, the most recent______

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问题 The country has already sent up three unmanned spacecraft, the most recent______at the end of last May.

选项 A、has been launched
B、having been launched
C、being launched
D、to be launched

答案 B

解析考查独立主格结构。题干已有谓语，且这个句子的前后两部分是由逗号隔开的，因此逗号后面部分不能出现谓语动词，可排除A。C项表示正在被发射，D项表示将被发射，与后面的时间状语不符，也可排除。B表完成、被动，符合题干。

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