One day,I was cooking in the kitchen _the telephone rang .填when 不填as .他们区别是什么
问题描述：
One day,I was cooking in the kitchen _the telephone rang .填when 不填as .他们区别是什么
答
当一个动作发生时另一个动作正在进行用WHEN,而AS指两个动作同时发生‘一边……一边……’,故这里用when