When did you start to work in this company?___ .I have worked here for fifteen years.
题目
When did you start to work in this company?___ .I have worked here for fifteen years.
A in my twenties B since 1997 C During the 1990s 我觉得是A,但老师说是B when不应该是时间点吗?B的话算是一个点吗?
答案
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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