–Were you at school when he came to see you?–Yes I a math class.A. was having B. had C.

问题补充：

–Were you at school when he came to see you?

–Yes, I a math class.

A. was having B. had C. am having

答案：

解析：考察时态。本题的have不是表示拥有的意思,而是一个固定词组have s class上课；所以可以有进行时态。句意：—当他来看你的时候，你在学校吗？—是的。我正在上数学课。