it was 3 years before i had graduated from the university 对吗?也就是it is 过去式 before 过去完成时

it is over 30 years （）shengzhen was established as a special zone……befor since那个为什么 The English book was so interesting that she had read it for 3hours_she realized.A.when B.until C.befor D.after为什么选C It was 85 years还是 it has been 85 years? It was three years before he came it was about 100 years ago It's 3 years since I saw him last time.能不能换成it was... It is hard the work befor supper as it was和what it was的区别the road is 3 times as/what it was 3 years ago 用as it was还是what it was请说下理由. Once,I let a ture love,slip away befor my eyes,Once,I let a ture love,slip away befor my eyes,only to find myself regretting when it was too late It is anyhow cleaner than it was 100 years ago It took them nearly 3 years ( before )the new stadium was completed.为什么不用until it was eight years ag和that was eight years ago有区别吗? it was 和it is +before这两个的时态要注意吗it is 3 years before they.和it was 3 years before they.从句主句后面的时态怎么用 it is 3 years since he has been a doctor 怎么翻?还有it is 3 years since he was a doctor 怎么翻译1? it was 3 years before i had graduated from the university 对吗?也就是it is 过去式 before 过去完成时 请问it be…before…的句型用法…比如说it was 3 years before he … It was 3 years ago ______ he came back.我知道答案是after,请知道的告诉我,原题是:用before after since填空It was 3 years ______ he came back.It was 3 years ago ______ he came back.It is 3 years ______ he came b It was ten years since I left my hometown.改错