She writes for a magazine.she wrote for a magazine when she left college用for或since连接 可改动
题目
She writes for a magazine.she wrote for a magazine when she left college用for或since连接 可改动
答案
===She has been writing for a magazine since she left college.
===She has been writing for a magazine for four years,ever since her college graduation.
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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