问题
选择题
The computer system _____suddenly while Paul was searching for information on the Internet.
A．broke in
B．broke out
C．broke up
D．broke down
答案
答案：D
题目分析：考查动词短语辨析。句意：Paul正在上网搜索信息时，电脑突然出毛病了。A闯入，打断；B爆发；C分裂，解散，放假；D出毛病，损坏，失灵，分解，失控。故选D。