The Smiths,as well as Lisa,——to the film festival to be hold in shanghai next month
题目
The Smiths,as well as Lisa,——to the film festival to be hold in shanghai next month
——应该填什么是have been visited 还是visited
A has been invited B was invited C invited D have been invited
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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