Mary is busy ____a picture.A.to paint B.paint C.painting D.paints

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Mary is busy ____a picture.A.to paint B.paint C.painting D.paints
Mary is busy ____a picture.A.to paint B.paint C.painting D.paints

Mary is busy ____a picture.A.to paint B.paint C.painting D.paints
C.be busy doing sth .固定短语,意为"忙于做某事".