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ThecavemightneverhavebeendiscoveredhadnottheentrancebeenspottedbythedistinguishedFrenchpot-holer,Berger.这句当中的一个hadnot看得不是很明白

题目详情
The cave might never have been discovered had not the entrance been spotted by the distinguished French pot-holer,Berger.这句当中的一个had not 看得不是很明白
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答案和解析
这个句子里的had not.这个是个虚拟语气的用法就等于If the entrance had not been spotted by the distinguished French pot-holer.
虚拟语气有种句型就是if .had.=had.就是把if去掉.had提前.