-What do you usually do after school?-- I usually play basketball but sometimes

问题补充：

---- What do you usually do after school?

---- I usually play basketball, but sometimes I play piano in the

music room .

A. / , / , the

B. the , the , the

C. the , a , /

D. the , a , the

答案：

(答案→)A. / , / , the

B. the , the , the

C. the , a , /

D. the , a , the

解析：句意：放学后你通常干什么？我通常打篮球，但有时在音乐室弹钢琴。After school（放学后）此短语中不用冠词；在play 一词后跟球类名词时不用任何冠词，但跟乐器名词时必须加定冠词the。