英语三级B级

填空题 How do you know that your computer is infected?
You know it by____________________________ your compute'r.for virus with a software program.

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【答案】scanning
【解析】从原文“you may think you have a virus，but how do you really 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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