问题补充：
---Did you watch the basketball match yesterday?
---Yes, I did. You know, my brotherin 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：句意为你昨天看篮球赛了吗？看了，你要知道，我的弟弟在那场比赛上打球。故此处应该用过去进行时态。
