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?

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? 一道英语选择题9It had been important for American's economy ever __ colonial farmers grew tobacco.A.beforeB.afterC.sinceD.until最好写下理由 关于等比数列的一道选择题 一道关于等差数列的选择题 关于不定积分的一道选择题 一道关于少数民族的选择题, 一道关于矩阵的选择题 关于英语单选的一道题._____he told us______.A,Until;that we understoodB,Not until;did we understandC,It was not until;that did we understandD,Not until;then we understood 一道关于级数的选择题 见图 一道关于圆周运动的物理选择题 一道关于词语运用的选择题 一道关于基因工程限制酶的选择题~ 要一道关于牛顿第一定律的选择题 一道关于阴坡阳坡的地理选择题 一道物理关于力的选择题... 问一道关于定积分的选择题 关于until与after的英语选择题If a lot of people say a film is not good.I won't bother to see it,or I will___it comes out on DVD 为什么选until 而不是是after 关于until的选择题1.Don't get on or get off the bus until it ( ) A.stop B.has stopped C.is stopping D.won't stop 2.Has the train arrived?No.It ( )here until one o'clock tomorrow.A.hasn't got B.didn't arrive C.won't get D.didn't leave 正确答