I did not understand the problem.He explained it.请用until把两句连

i did not understand the problem until he had explained it.我 请问一个英语问题：I did not understand the problem.He explained it 两句 i did not understood the problem until he had explained it这句 i did not understood the problem until he had explained it. i did not realize my mistake until he explained it to me改成倒装 英语翻译1.i explained the problem to him,but he did not believe i didn't understand the problem until it_____(explan) again Not until yesterday did I notice it. he did not go home until he finished the work.为什么这里要用until?不 It was not until the deadline did he post his letter和badid改成 1.The more you explained, ____ I found it to understand. It was not until midnight did he come back.