It was three months since he came to our school改错
题目
It was three months since he came to our school改错
答案
应改为 It is three months since he came to our school.或者是改为：It has been three months since he came to our school.(这是一个现在完成时的句子,句型结构为 It is/has been + 一段时间 + since 从句)
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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