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

Whichofthefollowingcanbestserveasthetitleofthepassage?

Accordingtothenews,Rodinapartyisbecomingimportant______.

Whycan’tthefamilystayatthehotelonthefollowingweekend?

Recently,CongressionalDemocratsintroducedlegislationtomakeiteasierforolderworkerstowinagediscriminationlawsuits.

ThreeyearsagoElonCollege,aschoolofmorethan4,000studentswitharisingacademicreputation,decideditwasnolonger

Thechildrenprefercampinginthemountains________anindooractivity.

Whatpromptedthisconversation?

LongitudeandLatitudeThemeridiansoflongitudeareimaginarygreatcirclesdrawnfrompoletopolearoundtheearth.By

It’shardtogivea(n)_____opinionaboutyourownchildren.

Moralresponsibilityisallverywell,butwhataboutmilitaryorders?Isitnotthesoldier’sdutytogiveinstantobedienceto

女性，28岁，5个月来肥胖，出现痤疮、紫纹。化验血皮质醇增高，血糖增高，小剂量地塞米松抑制试验血皮质醇较对照低30％，大剂量地塞米松抑制试验血皮质醇较对照低80％。该患者最可能的诊断是

秋季腹泻最常见的病原体是()。

长沙某公司因业务关系，需要在上海海关办理报关业务。由于该企业已在长沙海关办理了注册登记手续取得了报关权，因此，不需再到上海海关办理注册登记手续。()

赫—俄理论与当代发达国家间贸易迅速发展的实际情况不符。()

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