what were you doing怎么回答

　　What did you do与What were you doing的区别：

　　What did you do ...? 一般过去时，询问过去做过什么？例如：

　　What did you do yesterday?

　　昨天你做什么了？

　　I did my homework yesterday.

　　昨天我做作业了。

　　What were you doing ...? 过去进行时，询问过去某一时间段或某一时间点正在做什么？例如：

　　What were you doing at 9:00 last night?

　　昨天晚上9点你正在做什么？

　　I was doing my homework at 9:00 last night.

　　昨天晚上9点我正在做作业。