Who is knocking at the door?---_____ may be Mary.A.She B.He C.It D.This为什么不是A呢？主语是Mary啊

为什么是is knocking：Who is knocking(knock) at the door?it's me. Someone is knocking at the door,but who can____ be? 单句改错 who is the men knocking at the door who is knocking at the door?A.This is me knockingB.It's me. who is knocking at the door?it is ()me还是i呢?求理由 Tom didn't feel well.So he went to the office to ( ) leave.A.please B .call C.ask for D.beg2.My parents always tell me ( )on the road .A .not play B.not to play C.to play D.not play3.Listen.Who ( )the door A.knocking at B.is knocking C.is knocking at someone is knocking at the door.who [ ]it be?A;mustB;canCmayD;shall必须有理由 There is__(nobody,somebody.anybody,everybody)knocking at the door,Go and see who it is who is knocking at the door?i suppose------must be bob.A.the one B.it C.who D.he someone is knocking at the door,____ _____?如何变反义疑问句为什么 arent they I’ve been knocking at the door.I don’t think anybody is in.翻译下 When someone is knocking at the door,you may ask______?A.Who are you B.Who it is C.What are you D.Who is it 请看下面的句子：Who is knocking at the door?I think (it) is Li Lei.为什么要用it? Someone is knocking at the door,but who can____ be?A.one B.he C.she D.it 6.There is someone knocking at the door,who _____ it be?A.can B.may C.must D.need 一道英语填词题There is someone knocking at the door.Please go and see who （ ）（是谁） Someone is knocking at the door,but who can （ ）be.A one B heC It D this说出原因 someone is knocking at the door,who is it? A this is a policeman B that is a policemanC shi is sandyteacher Dit is the milkman