When a fire __________at the National Exhibition, at least ten priceless paintings were completely destroyed
问题描述：
When a fire __________at the National Exhibition, at least ten priceless paintings were completely destroyed
a、broke off
b、broke out
c、broke down
d、broke up
答
B 爆发 如果这次全国展览上发生火灾的话,至少有十幅极其贵重的画将被毁坏.
break out
v.
突发,爆发,叫嚷,使作准备,取出,倒空,把...备好待用