who is singing?it must be susan.为什么是用it

Someone is singing in next room.Please go and see who it is.为什么是 who it is who is singing?it must be susan.为什么是用it who is singing next room?is it Maria?no ,it ?be her.she is still at school at this time Listen!Someone is singing next door.Who ( ) it be?填can还是may? Someone is singing now.Who （）it be?A.must B.should C.can D.will 2.Who is singing there?( ) me.A.This B.That is C.It is D.I am the question is who puts ink on mu who is singing in the next room 为什么who 后面要跟 is singing? -Who is singing in the next room.-_ must be Marie A.It B.She C.This D.There 1.Who’s singing over there — ________ is Sandy’s sister.A.That B.It C.She D.This I think it is very easy ----(answer) this question.Please use this sentence pattern-----(write) five sentences.Do you know who--------?A.is singing B.is sing C.sings is D.singing is直接写答案,不要再复制一遍题! Listen!Who ____?A.singing B.is sing C.is singing listen!who is singing the song _____(happy) listen,who is singing in the classroom?变成 are A:who is singing in the classroomB:It must be susan A she B it C this d he为什么选B It is not singing alone.It is singing with other birds now. Listen!Who is singing in the next room?这里为什么要用singing who is it