The computer system____suddently while he was searching for information on the Internet.
A．broke downB．broke outC．broke upD．broke in
A
考查動詞短語。break down“出故障”符合句意；break out“爆發(fā)”；break up“分解；拆散”；break in“  闖入；打岔”均不合句意。
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