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When a fire（）at the National Exhibition, at least then priceless paintings were completely destroyed.
Abroke off
Bbroke out
Cbroke down
Dbroke up
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请教:1995年6月大学英语四级(CET－4)真题第2大题第19小题如何解答?
【题目描述】
第59题：When a fire ________ at the National Exhibition in London, at least ten priceless paintings were completely destroyed.
A) broke off
B) broke out
C) broke down
D) broke up
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