One day,I was cooking in the kitchen _the telephone rang .填when 不填as .他们区别是什么
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One day,I was cooking in the kitchen _the telephone rang .填when 不填as .他们区别是什么
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
电话铃响是瞬间动词,只能用when,不能用as