John was listening to the radio ______ his father washed his car.
参考答案是 when。我认为也可用 while,请专家老师解惑,十分感谢您一直无私的指导。
同意你的看法。如果表示主句和时间状语从句谓语动词的动作同时发生,而且从句的谓语动词是延续性动词,引导从句的 when 通常可以与 while, as 互换使用。例如:When (或 While,或 As) I was in the park, I saw two men fighting. 我在公园时,看见两个男人在打架。(摘自《薄冰英语惯用法词典》)