If I had seen him yesterday,I would have told him the news.
题目
If I had seen him yesterday,I would have told him the news.
这是一道选择题,选主句成份,最后选would have told .答案给出的分析是：“条件从句用过去完成时,主句用would have done.”
难道用should/could/might+have told 不可以?此题不是与过去相反的虚拟语气么?
答案
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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