---Whatdoyouprefertodowhenyouarefree?---________．A.Iprefertoplaybasket

---What do you prefer to do when you are free?---________．A.I prefer to play basketball to listen to musicB.I prefer playing basketball to listen to musicC.I prefer playing basketball to listening to musicD.I prefer to play basketball to listening to music

C解析prefer的常用句型为prefer doing sth．to doing sth．和prefer to do sth．rather than do sth．，所以应选C项。

好好学习下