it __long before we ___ the result of the experimentwill noy be;will knowis;will knowwill not be;knowis;know

it __long before we ___ the result of the experimentwill noy be;will knowis;will knowwill not be;knowis;know It __long before we celebrate the NEW YEAR'S Day.A isn't B hasn't been C wasn't D won't be请问选哪个谢谢. Before we knew it 怎么翻译? We must take ____(act) before it is too late We implored him to act before it was too late. What do we call it before a chicken ---(be) born? We must get there before it ___(begin)to rain. It will be three years before we meet again. We must C----------- your food well before you swallow it it well be three years before we can meet again It won't be long before we hit the road. It will be two years before we meet again 翻译 改错 We find it impossible get there before 8：00 we'll make it before the clock strikes nine Two years has _____ _____(流逝) before we knew it. Life is half spent before we know what it is. it will not be long before we can meet again.为什么不用before long Before we knew it, we had to say goodbye to the famers.这里的before怎么解释