—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. are reading

答案：

解析：此题重点考查过去进行时的基本用法，表示在过去某个时刻正在进行的动作或存在的某种状态。根据语境可知此句的含义在昨天的这个时候你在干什么。故用过去进行时。过去进行时的基本构成是was或were+ving，故选B。