what-he-(do)at this time yesterday

问题描述:

what-he-(do)at this time yesterday

what does he do at this time yesterday ?

What was he doing at this time yesterday.
因为有at this time 要用过去进行时。

what were he doing at this time yesterday ?昨天这个时候他在做什么?

What did he do at this time yesterday?他昨天这个时候做了什么?

要看具体语境
如果是单句,一般可以用
What was he doing at this time yesterday?