.0328(1)请教一个句子,谢谢lalalalalath

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/13 13:54:05

.0328(1)请教一个句子,谢谢lalalalalath
the cave might never have been discovered had not the entrance been spotted by the distinguished French pot-holer,Berger.
若不是法国著名洞穴探险家Berger由于偶然的机会发现了这个洞口的话,这个洞穴也许永远不会为人所知.
请问：我觉得the cave might never have been discovered by the distinguished French pot-holer,Berger语法上就是一个完整的句子了吧,那么had not the entrance been spotted 是做什么成分?是不是省略了什么?

had not the entrance been spotted 是做什么成分?是从句吗?是不是省略了什么?
是从句,没有省略,这是一种惯用法,相当于 if the entrance had not been spotted by.

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