问题补充:
What at that time ? ---Playing football.
A. did you do
B. do you do
C. were you doing
D. are you doing
答案:
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。
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