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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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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Medievalistsusuallydistinguishmedievalpubliclawfromprivatelaw:theformerwasconcernedwithgovernmentandmilitaryaff

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