Question

We ___________ when the teacher came in.

A．were talking	B．talked
C．talk	D．are talking

Answer 1

A

A “正在做某事时，某事突然发生”常用when，即be doing sth. When sth. else did（用动词的过去式）。“我们正在谈话时，老师进来了。”故用过去进行时。故选A。