He felt it a great honor____to visit me when I was in his city
题目
He felt it a great honor____to visit me when I was in his city
A to have been taken B to have taken
C being taken D having taken
答案
过去的过去,需要向前推一个时态,所以要用现在完成时,加上是被动,表示“被带去”,所以选a.
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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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