The computer system suddenly _______ while he was searching for

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
【正确答案】:A
【题目解析】:break down 打断,发生故障;break out 爆发;break up 打碎;break in 闯入句意:当他在互联网上搜索信息时,电脑系统突然停止了工作。因此A正确