Listen!I hear someone _____the violin in the next doorA、playingB、playC、playsD、to play

Listen!I hear someone _____the violin in the next doorA、playingB、playC、playsD、to play
Listen!I hear someone _____the violin in the next door
A、playingB、playC、playsD、to play

Listen!I hear someone _____the violin in the next doorA、playingB、playC、playsD、to play
100% 对 A ,My mother is an English teacher.