The puter system suddenly while he was searching for information on the Internet.
A. broke down
B. broke out
C. broke up
D. broke in
网友回答
(答案→)A. broke down
B. broke out
C. broke up
D. broke in
解析：考查动词短语语意的区别。句意为：“正当他在网上查信息的时候，电脑系统突然瘫痪了。”break down： (机器或车辆)出故障、坏掉。break out： (战争、打斗等不愉快事件)突然开始。break up：结束；解散，散开；变得虚弱、垮掉。break in：强行进入；破门而入。选A。