The cave might never have been discovered ______ by the distinguished French potholer Ber

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The cave might never have been discovered ______ by the distinguished French potholer, Berger.

A.not spotted the entrance

B.without the entrance spotting

C.not the entrance having been spotted

D.had the entrance not been spotted

请帮忙给出正确答案和分析,谢谢!

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  • 正确答案:D
    虚拟语气题。主句的mightneverhavebeen表明是对过去情况的虚拟,从句需用过去完成时,故D正确。虚拟语气在条件状语从句中如果省略连词if,从句须部分倒装,D项hadtheenUancenotbeenspotted…为iftheenhancehadnotbeenspotted…的省略形式。