before 的选择题untilhe works ____ five o'clockA.bofore B.until为什么啊?选Bbefore好像也讲的通啊，他五点钟之前在工作

before 的选择题untilhe works ____ five o'clockA.bofore B.until为什么啊?选Bbefore好像也讲的通啊，他五点钟之前在工作 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? 一道简单的选择题,求思路=w= 一道关于until的选择题It's dangerous ______it stopsA.until B.before为什么until不可以啊? long before,before long,soon before,before soon的区别 We all know comes before Thursday,know后面填什么单词?（单词的首字母为W） 帮我解释一下这道关于before long和long before的选择题——Has Bob returned from Japan?——Yes,he arrived two months ago,but it wasn't________ he went to Hong KongA.before long B.long before C.long after D.soon after这道题的正确 1简单的英语选择题 在线等第2题 为什么选这个我大致了解 但是long before 不是过去时的标志吗? 一道初三关于before的选择题Did you ask your aunt______two days before?A.what was happened to her B.what she happenedC.what she had happened to D.what had happened to her 步步为营Tony,w( )your hands before lunch!填空 过去分词作状语的选择题Before ______ white,the door should be cleaned thoroughly.A paintedB being paintedC having been painted为什么?每个选项都说明一下, 一道英语定语从句选择题Great changes around us take place before our eyes every day___we pay little attention.which ,为什么where 是错的? 必修一化学：关于氨水的选择题若以w和w分别表示浓度为 a mol/L和 b mol/L氨水的质量分数,且知2a=b,则下列推断正确的是（氨水的密度比纯水的小）………（ ）A.2w=wB.2w=wC.w>2wD.w<w<2w拜 标有PZ220——50字样的灯泡接在110v的电路中, 实际功率怎么求是选择题.A. 40W B.20W C.12.5W D .无法判断 一个关于电功率的物理选择题将一灯泡直接接到电源上,功率为100 W,用长导线将灯泡串联后接到同一电源上,功率为91 W,则导线上损失的功率是 A.19 W B.9 W C.10 W D.1 W before long 和long before的区别 long before ,before long的区别 before long 与 long before的区别