Who is playing the guitar in the next room?

Who is playing the guitar in the next room? Who is playing the piano in the next room?_______ is Li Ping Listen!Who ___ in the next room.A.is playing the piano B.pla listen ,my sister playing the guitar in her room(改错 listen ,my sister playing the guitar in her room(改错) mary is often heard ( )playing piano in the next room in the 将:Jane is playing the guitar in the dormitory. The musician who is playing guitar is my friend 为什么guitar前面不 who is singing in the next room 为什么who 后面要跟 is singing? who is singsing in the next room It ( ) my sister.She is goi listen () is crying in the next room who is singing in the next room?_____must be Maria.空格应该填It还是