Mr.Wang___a newspaper in the office at this time yesterday.

问题描述:

Mr.Wang___a newspaper in the office at this time yesterday.

was reading
昨天的这个时候,王先生正在办公室看报纸呢.
时间状语at this time yesterday决定了整个句子用过去进行时,表示过去的某一个时间正在进行的动作.