As long as we reached the top of the mountain,you can see the beautiful scenery这句话对吗
题目
As long as we reached the top of the mountain,you can see the beautiful scenery这句话对吗
答案
过去式,把主句的can 改为could就可以了
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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