英语三级B级

填空题阅读短文，回答题：

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

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本题答案：antivirus program。从原文Be sure to have a good antivirus program and update it regularly可以得到答案。注意题干中将a换成了an，所以在答案中就不能再用good了。

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