His brother joined the army two years ago.改为同义句
题目
His brother joined the army two years ago.改为同义句
答案
His brother has been a soldier for two years.His brother has been a soldier since two years ago.It's two years since his brother joined the army.Two years has passed since his brother joined the army.
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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