Is Maria knocking at the door ? ------It( )be her. She is in Australia now.A.may not B.needn't C .mustn't D.can't翻译

（中考英语）--Is Maria knocking at the door --Is Maria knocking at the door --It( )be her.She is in Australia now.A.mustn't B.can't可是我觉得A也可以,因为题目中已经说了“Maria现在在澳大利亚”,所以A应该也可以用 Is Maria knocking at the door ? ------It( )be her. She is in Australia now.A.may not B.needn't C .mustn't D.can't翻译 someone is knocking at the door.It might be the posyman.为什么用is knocking 为什么是is knocking：Who is knocking(knock) at the door?it's me. Someone is knocking at the door.____ is it? There is someone knocking at the door.为什么用“knocking”,要加“ing”? Listen!_______(有人）is knocking at the door. Someone is knocking at the door,but who can____ be? 单句改错 who is the men knocking at the door Someone is knocking at the door.同义句改写：There is ___ ___ at the door. Someone is knocking at the door._must be TomSomeone is knocking at the door._must be Tom A.that B.It C.He D.This Is Lucy knocking at the door?No.It _____ be Lucy.She is in Japan now. who is knocking at the door?A.This is me knockingB.It's me. There is somebody knocking at the door .Go to see( ) it is. who is knocking at the door?it is ()me还是i呢?求理由 It is impolite to come into the office without ( )the doorA.knock B.knocking at C.to knock at D.knocking to someone is knocking at the door.who [ ]it be?A;mustB;canCmayD;shall必须有理由 There is someone knocking at the door.It may ________ (be) the postman.如题