it was thirty years until they were able to reunite 能代替 it was thirty years before they were吗
题目
it was thirty years until they were able to reunite 能代替 it was thirty years before they were吗
答案
it be +段时间句型通常用since before具体为it+was/will be +段时间+before具体为it+is/has been+段时间+sinceit was thirty years until they were able to reunite此句应把until改成since至于它能否代替第二句不好...
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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