一道英语单选,
题目
一道英语单选,
He doesn't live here.He ________ his uncle who works in this city until the end of his vacation.
A.just visits
B.just visited
C.is just visiting
D.has just visited
答案
C.
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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