【题目】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
在线课程【答案】A
【解析】句意：当他正在互联网上搜索信息时，计 算机系统出了故障。break down意为“(机器等)出现故障”，符合句意。break out“(战争、火灾等)突然发生”；break up“解散；驱散”；break in“闯入”。