解释几道单选题!
题目
解释几道单选题!
1."Where's your uncle's home?" _ in Boston in the past years.
A He's lived B He's living C He's lives D He lived
答案
a.he's lived=he has lived因为有时间状语in the pastfew years 须用完成时
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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