---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
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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。