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  3. The onset of a new generation of computer attacks was marked by ______. What does the word "they" (Para. 4) refer to?

The onset of a new generation of computer attacks was marked by ______. What does the word "they" (Para. 4) refer to?

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问题 The onset of a new generation of computer attacks was marked by ______.
What does the word "they" (Para. 4) refer to?
选项 A、organized gangs.
B、PCs infected.
C、copies of the virus.
D、their files.
答案B
解析 这是一道词义题。依据第四段的内容可知，"they"指代的是PCs infected。
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考研英语一

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