The girl often plays piano in her bedroom.A. anB. theC. /D. a

问题补充：

The girl often plays piano in her bedroom.

A. an

B. the

C. /

D. a

答案：

A. an

(答案→)B. the

C. /

D. a

解析：play后跟乐器通常加定冠词the，piano是钢琴的意思，故选B。