2. 外语
  3. What should you do to protect your computer from a virus? You must make sure that you have an ______ . How do you know that y

What should you do to protect your computer from a virus? You must make sure that you have an ______ . How do you know that y

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问题 What should you do to protect your computer from a virus?
You must make sure that you have an ______ .

How do you know that your computer is infected?
You know it by ______ your computer for virus with a software program.
选项
答案scanning
解析 从原文“you may think you have a virus, but how do you rely tell? You scan your system for viruses with a software program”可以得到答案。题干中scan作by的宾语，所以转化为scanning。
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