it is nothing very secret, but it is always ______ to keep quiet about these
题目
it is nothing very secret, but it is always ______ to keep quiet about these
A, or rather B. as well as C. either D. as well
这题选什麼?为什麼?
啊哦，答案是D，就是不知道为什麼……
答案
D 吧～～
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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