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题目内容
（东华大学大学英语4）
166. The computer system ___________suddenly while he was searching for information on the Internet. 在他上网查找资料的时候计算机系统突然瘫痪。
A. broke down 坏了 B. broke out C. broke up D. broke in
A. broke down 坏了 B. broke out C. broke up D. broke in
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