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The country has already sent up three unmanned spacecraft, the most recent ________ at the end of last March.
A.has been launchedB.having been launched
C.being launchedD.to be launched
B

这题考查独立主格结构,结构是:名词+非谓语,此句前后句没连词,只有逗号是不能连接两个句子的,所以后边the most recent ______ at the end of last March就是独立主格的形式了,在句中做伴随状语,又因为事情发生在过去,所以用现在分词完成时。选B。
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