you had told me that some time earlier .the tickets for the concert have just been sold out
题目
you had told me that some time earlier .the tickets for the concert have just been sold out
A Whether B If only C Unless D Even if
答案
B要是/倘若
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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