They enjoyed piano.A. playB. playingC. playing theD. to play a

问题补充：

They enjoyed piano.

A. play

B. playing

C. playing the

D. to play a

答案：

A. play

B. playing

(答案→)C. playing the

D. to play a

解析：考查固定搭配。Enjoy doing sth.“喜欢做某事”。句意“他们喜欢弹钢琴。”故选C。