◎ 题干
This computer doesn’t work properly, because a certain virus has ____ the operating
system.
[     ]
A. broken up
B. broken down
C. broken out
D. broken away
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“This computer doesn’t work properly, because a certain virus has ____ the operating system.[ ]A. broken upB. broken downC. broken outD. broken away…”主要考查了你对  【动词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。