问题描述：
Jackon is a talented boy,he's often heard ( ) the violin.A.to play B.playing C.play D.plays
Jackon is a talented boy,he's often heard ( ) the violin.A.to play B.playing C.play D.plays
Jackon is a talented boy,he's often heard ( ) the violin.A.to play B.playing C.play D.plays
问题解答：
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