Who () in the next room.填is singing 还是sings 语法说明 原题没有表时态的词语

Who () in the next room.填is singing 还是sings 语法说明 原题没有表时态的词语 who is singing in the next room?_____must be Maria.空格应该填It还是 1..Listen!A boy in the next room.A.sings B.is singing C.sang do you hear her____ in the next room? A sings B singing C is who is singing in the next room 为什么who 后面要跟 is singing? Listen!Who is singing in the next room?这里为什么要用singing who is singing in the room? 句子“listen!there is someone singing in the next room"时态是现在进行时 Who heard him singing in the next room?(被动语态) ——Listen!Who is singing in the next room?——Gina _____. WHO's singing in the next room?is that ann it___ be her .she Tom go to see who () in the next room.A.is singing B.was sin