before和until的区别有道题是The student didn't leave the classroom______the bell rang.应该填before还是until?我们做过两次这道题了,而且一次是until一次是before而且是唯一答案!到底怎么回事?（不回答这个也

before和until的区别有道题是The student didn't leave the classroom______the bell rang.应该填before还是until?我们做过两次这道题了,而且一次是until一次是before而且是唯一答案!到底怎么回事?（不回答这个也 until和before 的区别. until 和before的区别you can't go out ____ your work is being done是填until还是before 为什么 not before和not until的区别 before until之间的区别 before和until的区别及用法,要有例句 until和before有什么区别? before和until的区别May i go and play with dick this afternoon, mum?no, you can't go out () your work is done.A. beforeB. until此题选什么,为什么? before,after,until的用法与区别? He didn’t tell me anything ______he left.A.until B.before C.after D.since并回答提问的问题(连词before与not...until的区别) until和before用法的区别是什么?until和before用法的区别一直很困扰我,该用until的时候我用before,该用before的时候我用until.麻烦请高人解释一下until、before各自的用法,越详细越好,因为本人要考专八 until和before的区别I didn't go home () my father got home我感觉都可以啊.谁帮帮我区分下（不光着一个题,以后遇到了最好使我都能区分开） before和untilHe didn't tell me anything ____ he left.A.beforeB.until我感觉是not until,那before为啥不行呢? 英语中before,after,when,until的用法和区别（最好有例子!） until和not until的区别 not until 和until的区别 not until 和 until的区别 how many years will have to pass______scientists succeed in providing a treatment for cancer?a,until b.before until 和before 的区别.