who is singsing in the next room It ( ) my sister.She is goi

who is singsing in the next room It ( ) my sister.She is goi -Who is singing in the next room.-_ must be Marie A.It B.She She is singing in her room. 对singsing提问 WHO's singing in the next room?is that ann it___ be her .she Who is playing the guitar in the next room? 填冠词 Who is the ( ) girl she is ( ) my sister who is singing next room?is it Maria?no ,it ?be her.she is s who is singing in the next room?_____must be Maria.空格应该填It还是 helen is singing in the next room .-It--be helen.she has gon Iisten!Helen is singing in the next room.It ( ) be Helen.She who is the ( ) girl?She's ( )my sister.填冠词 Who is that in the room?It is me.知识点