—Did you watch the basketball match yesterday?—Yes I did.You know my brother in the match

问题补充：

—Did you watch the basketball match yesterday?

—Yes，I did.You know，my brother in the match.

A. is playing

B. was playing

C. has played

D. had played

答案：

A. is playing

(答案→)B. was playing

C. has played

D. had played

解析：根据题意，该空表示在过去某段时间(yesterday)内正在进行的动作，意思是昨天我弟弟正在参加比赛，因此，应用过去进行时。