—What was the teacher doing at that time?—He lessons at school.A. givesB. gaveC. was givin

问题补充：

—What was the teacher doing at that time?

—He lessons at school.

A. gives

B. gave

C. was giving

D. is giving

答案：

A. gives

B. gave

(答案→)C. was giving

D. is giving

解析：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。