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

游客2023-10-27  22

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

选项 A、not spotted the entrance
B、without the entrance spotting
C、not the entrance having been spotted
D、had the entrance not been spotted

答案 D

解析 主句的might,never have been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had the entrance not been spotted…为if the entrance had not been spotted…的省略形式。
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