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【题目】The computer system_________ suddenly while he was watching news on the Internet.

A. broke out B. broke in

C. broke up D. broke down

【答案】D

【解析】

试题分析:考查动词短语。broke out战争或自然灾害等突然爆发;broke in闯入;broke up分手、分解;broke down抛锚,身体垮掉,生意失败,崩溃,谈判失败。本句句意为:当他在网上搜索信息时,计算机系统突然……。根据句意,选择D最为恰当,表示系统崩溃。

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