"Who's knocking at the door?" "______ is Kate."A. it B. this C. he D. she请高手给个确切的答案,再讲下其中的语法知识,谢谢!

为什么是is knocking：Who is knocking(knock) at the door?it's me. -Who's knocking at the door?- ____ me Tom.It's That's哪个呢? who is knocking at the door?A.This is me knockingB.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 改错:We think it's impolite to go into his room without knocking at the door,don't we? Don't come in before knocking at the door.before 后面的 knocking用的对吗? who was knocking at the door just now?还是who knocked at the door just now? --Who's knocking at the door?--I'm not sure Maybe___is my good friend Jack.A.he B.it C.she D.him who is knocking at the door?it'me 还是I am 还是 it's I要详细一点 说明它们的区别 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 同义句转换：Don't make any noise.There's someone knocking at the door.Be quiet.There's ___ ___at 英语翻译Someone＿comes knocking at his door,door,door,But who and what＿stands where he's not sure,sure sure He opens,he＿listens,he looks to left and right but nothing＿seems to move in the pale moonlight so who＿comes knocking at his door, 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?it is ()me还是i呢?求理由 he stopped to see who was knocking at the door 是seeing还是to see? knocking on heaven's