Look! David is busy ___ the guitar.A.play B.plays C.playing D.to play

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Look! David is busy ___ the guitar.A.play B.plays C.playing D.to play

C
be busy doing

C

C be busy doing sth ,忙于做某事。
还有be always doing sth 总是在做某事(带有厌恶的感情色彩)
如he is always sleeping in class.