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

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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

解析虚拟语气题。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 enUance not been spotted…为if the enhance had not been spotted…的省略形式。

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专业英语四级

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

专业英语四级

Whenyouvacatetheroom,youshould______thedoorkeytome.

TheUNresolutionisaboutinternationaleffortsintighteningcontrolon______

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Thenaturalenvironmenthas,ofcourse,alwaysconditionedtechnology.Forexample,thenatureofanenvironment(polar,desert,

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