The computer system suddenly while he was searching for information on the Internet.A. b

问题补充：

The computer system suddenly while he was searching for information on the Internet.

A. broke down

B. broke out

C. broke up

D. broke in

答案：

(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。