问题
选择题
The computer system____suddently 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
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。