I __________computer games at home when my cousin_____________me.

A．was playing, was ringing

B．was playing, rang

C．played, rang

D．played, was ringing

下列哪一种打法不属于歼灭战的作战方法（）

A.先打分散孤立之敌，后打集中强大之敌

B.先夺取广大乡村和中小城市，后夺取大城市

C.集中优势兵力，各个歼灭敌人

D.先保守或夺取大城市，与集中强大之敌打消耗战