—What were you doing at this time yesterday?—We in the classroom. A. read B. were reading

问题补充：

—What were you doing at this time yesterday?

—We in the classroom.

A. read B. were reading C. was reading

答案：

解析：根据问句昨天这个时候你正在做什么？可知回答要用过去进行时态：was doing ,主语是第一人称复数，故选B