they were (playingfoot) just now.对括号里的部分提问 ()()they ()just now?

问题描述:

they were (playingfoot) just now.对括号里的部分提问 ()()they ()just now?
为什么啊?讲详细一点啊

What were they doing just now?(刚才他们在做什么?)
当提问到动词/动作时,用doing来替代,