Nothing less than a miracle could have saved him.为什么说:could have saved 这是什么语法呢?

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Nothinglessthanamiraclecouldhavesavedhim.为什么说:couldhavesaved这是什么语法呢?Nothinglessthanamiraclecouldhave

Nothing less than a miracle could have saved him.为什么说:could have saved 这是什么语法呢?
Nothing less than a miracle could have saved him.
为什么说:could have saved
这是什么语法呢?

Nothing less than a miracle could have saved him.为什么说:could have saved 这是什么语法呢?
could have done
表示对过去的推测

意思是:(这个时候)没有什么能救他,除非有奇迹发生。
因为是假设的语气,所以用could have done