Tom go to see who () in the next room.A.is singing B.was sin

Tom go to see who () in the next room.A.is singing B.was sin Someone is singing in next room.Please go and see who it is. -Who is singing in the next room.-_ must be Marie A.It B.She I often hear her( )in the next room.a/sing b/is singing c/to tom, go and see who _____in the next room. who is singing in the next room 为什么who 后面要跟 is singing? go and see who --------（cry） in the next room Listen!Who is singing in the next room?这里为什么要用singing 1..Listen!A boy in the next room.A.sings B.is singing C.sang 2.Listen!Someone ____ in the next room.A.sing B.singing C.is do you hear her____ in the next room? A sings B singing C is who is singing in the room?