既然是last March,排除CD,因为是已经完成的
如果是A,就成了两个独立的句子,逗号不能连接两个独立的句子.
所以选B,使后半句成为分句
〖07山东〗The country has already sent up three unmanned spacecraft,the most recent ________at the end of last March.
〖07山东〗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
A.has been launched B.having been launched C.being launched D.to be launched
英语人气：563 ℃时间：2019-11-06 00:42:34
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