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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
A hacker could take control of the entire system by implanting his own instructions in the software and then he could program th
admin
2013-11-24
33
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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