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：
B。此处用过去进行时表示当时正在进行的情况。
