问题补充：
----Why didn’t you go to the concert ?
-----I a game between two American basketball teams
A. watched
B. had watched
C. was watching
D. had been watching
答案：
A. watched
B. had watched
(答案→)C. was watching
D. had been watching
解析：考查时态。句意：—为什么你没有去听音乐会？—我正在看两支美国球队之间的篮球赛。根据句意说明是在音乐举行的同时所发生的事情。故使用过去进行时。故C正确。
