Every time I went there, I could hear him ________ the piano in his room．
A.playB.playingC.playedD.to play在线课程B
考查非谓语动词。句意：每一次我去那儿都能听见他在房间里弹钢琴。hear sb．doing听见某人正在做某事；hear sb．do听见某人做某事全过程；hear sb．done听见某人被……。