题目

完形填空     阅读下面短文，从文后所给A、B、C、D四个选项中选出一个最佳答案。A few days ago, I got a call from an old friend of mine. We    1    our school and the good old days. Then, he started talking about his father.His father was badly ill in hospital. He   2    sleep at night and often talked to himself. My friend was    3    about this and shouted at his father to stop talking. But after stopping   4   , his father fell unconscious(不省人事的). My friend was very sad. He thought it was his fault(过错). My friend was so sad t、若是一元一次方程，则m的值是              （   ）A．±1B．-1C．1D．2