Mary is often heard playing piano in the next room in the evening.A. practiseB. to practi

问题补充：

Mary is often heard playing piano in the next room in the evening.

A. practise

B. to practise

C. practising

D. practiced

答案：

A. practise

(答案→)B. to practise

C. practising

D. practiced

解析：本题考查动词用法。hear sb do sth听说某人做某事，其被动语态中要加上to，故选B。句意：常听说Mary晚上在隔壁房间弹钢琴。