单选题 The tribe had been living in that part of the area for generations until the civil war______.

【正确答案】 C

【答案解析】解析：break down：毁掉，压倒，停顿；break off：中断，折断，突然停止，脱落，暂停；break out：突发，爆发；break up：破碎，分裂，结束。根据句意可知，C项最合适。