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

Withoutthefrictionbetweentheirfeetandtheground,peoplewould______beabletowalk.

BilingualeducationiscontroversialintheUnitedStates.【C1】______,agrowingbodyofresearchshowsthat【C2】______speakingtw

Whatcomestomindwhenyouheartheword—diversity?Issuesofraceorgendermayspringtomind.Equalrights?Orminorityissu

Eachyear,moreUSpropertieswithinfloodplainsaredestroyedbyfloodingthanfire.Changingweatherpatterns,increasedurban

Ifonlythecommittee______theregulationsandputthemintoeffectaspossible.

Researchersdiscoveredthatplantsinfectedwithavirusgiveoffagasthat______diseaseresistanceinneighboringplants.

Formanyyears,wehavebeenledtobelievethataperson’sintellectualintelligenceisthegreatestpredictorofsuccess.Soci

AlexisdeTocqueville,theFrenchpoliticalscientist,historian,philosopherandpolitician,ismostfamousforafour-volumeb

A、①B、②C、③D、④C

Itseemslikeeverythingisgoing【C1】________thesedays.Thatnowincludeseffortstoreprogramthehumangenome.AnewUni

慢性风湿性瓣膜病常见的联合瓣膜病变是

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某机场跑道主降端跑道号码是14，则该机场常年主导风向通常为()。

A、14．2B、16．4C、18．6D、15A从每行来看，第二个数字+第三个数字-1=第一个数字。0．9+6．5-1=6．4、1．6+6．2-1=6．8、7．2+8-1=(14．2)。

A、 B、 C、 A本题图片为三种小日用品：闹钟、台灯和收音机。句中提到的是settheclockfor(为闹钟定时)，因此答案是[A]。此外，由后面的时间数字6:30am也可知应选与时间有关的[A]。

BilingualeducationiscontroversialintheUnitedStates.【C1】,agrowingbodyofresearchshowsthat【C2】speakingtw