一道关于英语谓语动词的选择题

问题描述:

一道关于英语谓语动词的选择题
The country has already sent up three unmanned spacecraft,the most recent______at the end of Last month.
A.has been launched B.having been launched
C.being launched D.to be launched

C 首先这是一个句子,不能有两个谓语动词.所以A错误.be launched 这个动作发生在过去,而D表示将来,也错误.B项这种形式不用做后置定语,所以答案是C.