题目

My family suffered a lot three years ago when my father died in a car accident. It ___21___my mother, two younger brothers and me alone. At that time, I was in senior high school. As the ___22___ son, I had no choice but to ___23___of school and work in a factory. Life went on without any ___24___. I dared not ask for more and just thought about ___25___ my two brothers. However, it wasn’t easy, for I couldn’t ___26___ their tuition even if I worked day and night without rest. I also had to look after my sick mother. I wanted to go back to school, but it seemed to be a(n) ___27___ 2．结束南北朝时期分裂局面，实现全国统一的标志性事件是（　　）A．隋朝的建立B．大运河开通C．北魏建立政权D．隋军灭陈