How long have you lived in Suzhou?A.Since two years ago B.For two years ago C.Two years ago
题目
How long have you lived in Suzhou?A.Since two years ago B.For two years ago C.Two years ago
答案
A.Since two years ago
B.For two years ago 改成For two years 也行
C.Two years ago：为过去时时间
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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