His uncle has not been back ( ) he left home three years ago.
题目
His uncle has not been back ( ) he left home three years ago.
A for
B at
C since
D about
选那个?
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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