(always,usually,sometimes,never,yet) I have _____ been here before.Have you everbeen there?—No,
题目
(always,usually,sometimes,never,yet) I have _____ been here before.Have you everbeen there?—No,
Have you everbeen there?—No,not _____.
I often have a rest in the morning and _______ in the evening.
答案
never
yet
sometimes
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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