Question

—What was the teacher doing at that time?
—He        lessons at school.

A．gives

B．gave

C．was giving

D．is giving

Answer 1

C

根据语境可知此题考查过去进行时的基本构成，was或were doing sth表示过去某个时间正在做某事。因he是第三人称单数故选C。