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英语阅读理解(初二),求解答和分析.

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英语阅读理解(初二),求解答和分析.
 

 
英语阅读理解(初二),求解答和分析.
B
从这句得出:
if one computer in the network broke down,then the whole network stopped.So a new network system had to been set up.It should be good enough to be used by many different computers.