3.The computer system _____suddenly while he was searching for information on the Internet.(3分)
A. broke down
B. broke out
C. broke up
D. broke in
出自：西北大学大学英语（上）
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3.The computer system _____suddenly while he was searching for information on the Internet.(3分)
A. broke down
B. broke out
C. broke up
D. broke in
出自：西北大学大学英语（上）