The computer systemsuddently while he was searching for information on the Internet.A. bro

问题补充：

The computer systemsuddently 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。break down“出故障”符合句意；break out“爆发”；break up“分解；拆散”；break in“闯入；打岔”均不合句意。