题目内容：

whlie i was doing my homework,my mum was doing her housework.和whlie i was doing my homework,
my mum did her housework.有什么区别?请在23点前给答案!

优质解答

whlie i was doing my homework,my mum was doing her housework 这个表明我在写作业的时候妈妈正在做家务（过去进行时）whlie i was doing my homework,my mum did her housework 表示我在写作业的时候妈妈已经做完...