独立主格主语怎么找The country has already sent up three unmanned spac

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独立主格主语怎么找
The country has already sent up three unmanned spacecraft,the most recent having been launched at the end of last March
having been launched的主语是哪个?
为什么不能是The country
the most recent 是时间状语吗?

having been launched的主语是 the most recent （unmanned spacecraft,） ,它省掉了unmanned spacecraft,后半句的意思是“最近一架飞船在三月末发射”
不过个人觉得recent本身就表示“最近”的意思,再加一个most就画蛇添足了,或许就是这个让你感到迷惑.
如果主语是The country 的话有两点不妥：1是 the most recen无法解释,它不是时间状语；2是The country不可能“在三月末发射”.
还有什么不懂的可以再问我.

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