Question

The computer system _____suddenly while he was surfing the Internet.

A. broke up
B. broke out
C. broke in
D. broke down

Answer 1

答案D
短语辨析。A关系破裂；分解；B爆发；C闯入；D机器坏了，身体垮了；分解；抛锚；崩溃；结合句意可知D正确。句意：当他在上网的时候，计算机系统突然就崩溃了。