参考答案

正确答案：B
解析：break off的意思是“(使)突然结束，中断”等，例如：She broke off their engagement only a few weeks before they were due to be married．就在他们要结婚的前几周她解除了婚约。break up的意思是“结束，解散”等，例如：He lost his job and his marriage broke up．他失业了，婚姻也解体了。break out的意思是“突然发生，爆发”等，例如：Does everyone know what to do if a fire breaks out?大家都知道一旦发生火灾该怎么办吗?