【GMAT考满分逻辑CR题库】Which of the following most logically completes_真题_答案

题目内容

Which of the following most logically completes the argument?

A particular computer virus frequently infects personal computers through an email message. Even though virus-scanning software installed on a computer is designed to identify and alarm the user of a virus infection on that computer shortly after it occurs, this particular virus is rarely observed by virus-scanning software. This fact, however, does not mean that the computer's security systems have blocked installation of the virus, because _______________.

A
shortly after it appeared on the Internet, hackers modified the virus in a way that made it more effective
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B
the virus was able to replicate itself and then send itself to people in the victim's address book
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C
even after the virus had stopped spreading, the backdoors created during the initial infections remained active
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D
the virus was able to disable virus-scanning software and pose as a virus-removal tool
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E
the virus also altered the victim's operating system in a way that made it difficult to shut down the computer without cutting off power to the system
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正确答案: D

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