Was it Jack that/who you met in the supermarket yesterday?这哥句子里,that引导的可以理解成一个主语这里为什么不是用Whom引导啊？

I think it was jack who said that,---------?A don't I B doesn't he C didn't 1.It was unusual that Jack _____________(behaviour) well today2. so i didn't ask who it was,为什么不用Who that was !为什么要用who it was It ____ Jack and Mary who helped me the other day.为什么是was,而不是were? Was it Jack that/who you met in the supermarket yesterday?这哥句子里,that引导的可以理解成一个主语这里为什么不是用Whom引导啊？ who was in the classroom at that time?A.Yes,it's Jack B.None C.Anybody D.No onewho was in the classroom at that time?A.Yes,it's Jack B.None C.Anybody D.No one 这道题到底选B还是D?我觉得两个答案都可以啊? It is(was) +强调部分+that (who)+从句 Who was ____called this morning?为什么用it that? Do you know____had reported the accident to the police?A.who it was that B.that it was who 17__ she gave the postcards to?AWhom it was that B.Who it was that C.Who was it that 强调句it is（was) .that/who,其中it is（was)能不能写成it's/it was不能缩写么? Was _Bill _played basketball very much.a.that,that b.that ,it c.it ,who d.this ,who who is that boy?H( )is jack. It was __________________(因为下雨)that Jack missed the first class last Friday morning.(because it was in america ____she frist met Jack 填that when?which? 英语翻译Jack worked in a shop that sold clocks.He was always telling Harry to buy a new clock.But Harry,who lived next door to Jack,said he didn’t need one.　　“ Everyone needs a clock,” Jack said.“How do you know when it’s time to ge （ ）you met the Englishman?A.Where it was B.who it was that C.Where was it that D.Were was that Who knocked at the door?I thought it was Jack.回Who knocked at the door?I thought it was Jack.回答当中为什么有两个谓语,一个句子的基本结构是一个主词加一动词.