〖07山东〗The country has already sent up three unmanned spacecr
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〖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
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
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
The country has already sent up three unmanned spacecraft,th
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