they were talking loudly when the teacher came in”when the teacher came in “划线对划线部分提问_________ _______ they talking loudly?

问题描述:

they were talking loudly when the teacher came in
”when the teacher came in “划线
对划线部分提问
_________ _______ they talking loudly?

when did

When were
问时间用when,主语是they,复数,时态是过去时,系动词要用were