为何选B不选A?Not until two months ago ____ that his son was still alive.[A] he knew[B] did he know [C] he knows[D] he had known他是要说直到两个星期以前他才知道他的儿子还活着 .Not until two months ago 是不是句子状语?

when will you return from Japan?A.until next week.B.not until August.该题正确答案为B,请问为何不能选A? ___did the students realize they are wrong.A.It was until B.It was not until then C.Not until then D.Not until这题为什么要选C,选B不对吗? 为何选B不选A?Not until two months ago ____ that his son was still alive.[A] he knew[B] did he know [C] he knows[D] he had known他是要说直到两个星期以前他才知道他的儿子还活着 .Not until two months ago 是不是句子状语? It was____last week____ i knew the news A.until...that B.not until...when C.not until...that D.until...since答案是选C.not until用在什么句型?与until有什么不同.怎么区分? it was_back home after the experiment.为什么不选Cit was _____back home after the experiment.A not until midnight did he go B until midnight that he did not go C not until midnight that he went D until midnight when he did not go为什么不选C until 和unless区别i won't write to him ____he writes to me first.A until B unless为什么不选 until呢 not until 我不写信给他直到他首先写给我 until 和unless到底怎么区别呢 not.until 与not.beforeI could not finish the homework________.A.until he has come B.before he cameC.when he comes D.by he had come选那一个?为什么?着重介绍not until 和not..before的区别, 为何选B不选A 为何选A不选B make 后接的宾语补足语,谓语动词无论什么形式都可以吧,动词形式主要取决于与宾语的关系能不能用ingThe result of the entrance exams was not made______to de public until last Friday.A to be known B known 为何选B did not leave the room___he closed the windows.A.until B.when 选什么?为什么?为什么不选另外1个? 英语选择,强调句中的倒装______ did the students realize that they were mistaken about spiders.A.It was until then B.It was not until thenC.Not until then D.Not until when 为啥B不可以啊 主句过去时态until从句为什么是过去完成?偶遇一题：The doctor advised his patient not to take any violent exercise until he___completely.A.has recovered B.had recovered C.would recover D.recovered答案选的B,我不知为何?我认 ______the missing boy,they had to stay there for another two weeks.A.Not finding B.Not found C.Not having found D.Having not found为何选C不选A 采用RC耦合电路时,为了保证不失真地传送矩形脉冲（设脉冲宽度为 tw）,要求RC电路的时间常数满足（ ）.A、RC >> tw B、RC=tw C、RC 21.Not until I began to work __________how much time I had wasted.A.didn21.Not until I began to work __________how much time I had wasted.A.didn’t I realize B.did I realize C.I didn’t realize D.I realized这里为什么要选B 不选A? --Was his father very strict with him when he was at school?--Yes.He had never praised him ________ he became one of the top students in his grade.(Unit7-5)A.unless?B.until?为何选until?unless= if...not 放在句中可以表示 除非他成为尖 1.-Did Jack come back early last night?-Yes.It was not yet eight o'clock _____ he arrived home.A.when B.until.为什么选A不选B.NOT UNTIL句型阿.是不是和前面那个YES有关?2.In our childhood,we were often _______ by Grandma to pay attenti