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

游客2023-11-12  21

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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