david is the person (whom or who) i have been know for a long time.I met him at the first day i just
题目
david is the person (whom or who) i have been know for a long time.I met him at the first day i just came to Canada.He (is or was) a hospitable person.
答案
david is the person (who) i have （去掉been）( known） for a long time.I met him (at 改为on）the first day i just came to Canada.He (is ) a hospitable person.
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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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