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
正确答案及解析
正确答案
B
解析
break out意思是“（战争、疾病）的突然发生”，符合句意。break off意思是“中断、绝交”；break down意思是“抛锚、出故障”；break up意思是“打碎、分解”。
