not until he had talked to them did he realized hehad been wrong.中did是什么成分?

He did not leave his office until he had finished work这里从句为何用过去完成时? Not until he arrived home___ he find that this wallet had been stolen. 21.It was not until he arrived in class _____ realized he had forgotten his book. i did not understood the problem until he had explained it.这句可以改成i had not understood the problem until he explained it.这样 为什么 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, Not until Peter got home ______ that he had lost his keys.A.did he realizeB.he realizedC.had he realizedD.he had realized求区分 did not disturb him until he had fimished the work.但我认为We had nor disturbhim until he finished the work.为什么答案是前面那个呢? 求翻译the man did not buy a digital tv until he had saved enough money not until the game had began ---at the sports ground.not until the game had began ____at the sports ground A.had he arrive B.would he have arrive C.did he arrive D.should he have arrive not until倒装Not until he failed the exam__that working hard is important.A> had he known B>did he know C>he knew D>he had known选哪个,为什么 working hard is ...现在时 i had not understood the problem until he explained it.我再理解,过去完成式不应该是 had exlained Not until the game had begun_____at the sports groundA,should he have arrivedB,had he arrivedC,did he arriveD,he would have arrived not until的过去完成时有这样两个句子：1.The young man did not wake up until the bed had struck the ground.2.I had not understood the problem until he explained it.哪一个正确?具体讲讲原因呗. 英语选择~not until he arrived home ( ) he find that this wallet had been stolen.not until he arrived home ( ) he find that this wallet had been stolen.A.would B.did 为什么不是would呢? not until he had talked to them did he realized hehad been wrong.中did是什么成分? I did not understand the problem.He explained it.请用until把两句连在一起可是书上的原句是这样的：I had not understood the problem until he explained it.为什么是had not understood 呢 Not until then （ ）that he was wrong.A he realized B he did realize C did he realize D had he realized这里的各个选项详解 （ ） find out what had happened.a Until he woke up did he b Until he woke up to c Not until did he麻烦解释一下为什么不能选A,而选D