A hacker could take control of the entire system by implanting his own instructions in the software and then he could program th

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问题 A hacker could take control of the entire system by implanting his own instructions in the software and then he could program the computer to erase any sign______.

选项 A、of his being ever there
B、he ever has been there
C、of his having ever been there
D、of him having ever been there

答案C

解析根据空格处的意思：然后他能使计算机抹去他曾经留下的痕迹，可知空格处的主语为动名词，用名词与代词的所有格形式来表达，可排除B项，并且是过去已完成的动作，故选C。

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考博英语

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A hacker could take control of the entire system by implanting his own instructions in the software and then he could program th

考博英语

Thelowoperatingcostsoftheforeigncompanywill_____thehighlaborcoststhebusinesspaysinitsowncountry.

PainterFridaKahlo(1910-1954)oftenusedharrowingimagesderivedfromherMexicanheritagetoexpresssufferingcausedbyadis

His______personality,ratherthanhisgoodlooks,madehimpopularwithothers.

Ingeneral,oursocietyisbecomingoneofgiantenterprisesdirectedbyabureaucraticmanagementinwhichmanbecomesasmall,

Exceptionalchildrenaredifferentinsomesignificantwayfromothersofthesameage.Forthesechildrentodeveloptotheirfu

ReadthefollowingpassagecarefullyandthenwriteasummaryofitinEnglishinabout150words.Asimpleideaunderpinss

AreportconsistentlybroughtbackbyvisitorstotheU.S.ishowfriendly,courteous,andhelpfulmostAmericansweretothem.

Astheglobalvillagecontinuestoshrinkandculturescollide,itisessentialforallofustobecomemoresensitive,moreawa

Childrentendto______whileplaying,eveniftheymakeapromisebefore.

ThespeechwhichMr.Londonmade______theprojecthasbotheredmegreatly.

以挂号邮件向国家商标局寄出的商标申请文件，邮件信封的邮戳日期不清的，该申请文件的递交日为()。

对涉及下列哪类证据应当保密，需要在法庭出示的，不得在公开开庭时出示

米非司酮配伍米索前列醇终止中期妊娠的最大周数是

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下列关于“我的文档”说法不正确的是()。

企业在外地的分支机构或者从事生产、经营的场所，在办理税务登记时，还应当提供由______出具的在外地设立分支机构的证明。

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表扬或批评应该遵循的原则有()。