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：本题考查动词时态。根据题意，该空表示在过去某段时间（yesterday）内正在进行的动作，意思是昨天我弟弟在正在参加比赛，因此，应用过去进行时。
