Mr.Smith has been living in London since 1978.Mr.Smith has lived in London since 1979.
题目
Mr.Smith has been living in London since 1978.Mr.Smith has lived in London since 1979.
前句表示史密斯现在还住在伦敦，而后句不确定史密斯是否现在还住在伦敦，
答案
Yes,U are right.
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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