If one of the puters , the whole networks would be unable to work.
A. broken down
B. broke up
C. broke out
D. broke in
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(答案→)A. broken down
B. broke up
C. broke out
D. broke in
解析：考查动词短语辨析。Break down抛锚，出故障；身体垮掉；分解；break up关系破裂；分解；break out爆发；break in闯入；句意：如果有一台电脑出故障，整个网络系统都会瘫痪。根据句意说明A正确。