she often go there/she often went there 有何区别?
题目
she often go there/she often went there 有何区别?
答案
She often goes there. 表示她现在经常去那儿
She often went there. 表示她过去经常去那儿
often是可以适应过去时态的
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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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