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This computer doesn’t work properly, bec...

This computer doesn’t work properly, because the operating system has          .

    A.broken up                        B.broken down

    C.broken out                       D.broken away

 

B 【解析】本题考查动词短语辨析。句意:因为操作系统出了故障。”break down“破坏;出故障”。
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