What at that time ?-Playing football.A. did you doB. do you doC. were you doingD. are y

网友回答

A. did you do
B. do you do
(答案→)C. were you doing
D. are you doing
解析：句意：那时你正在做什么？——踢足球。根据答语及上文时间状语，可知本句描述的是过去某时正在进行的动作，故用过去进行时态，选C。