是playing a piano 还是playing piano

是playing a piano 还是playing piano 请问是playing piano 还是playing violin呢? I can playing piano 弹钢琴是我的爱好Playing the piano is my hobby还是playing piano is my h she is playing the piano.playing the piano划线提问 grace likes playing the piano playing the piano 中文是什么? I`d like是填playing还是to play,the piano and singing some songs帮 （he enjoys playing the piano now)还是（he is enjoying the piano Let's the piano.A.playing B.play C.plays The girl is good at playing a piano. she is playing ＿＿ in the room.a.piano b.pianos c.the piano 选