We know it was spring when the robins came .When they left,we know the winter ___
题目
We know it was spring when the robins came .When they left,we know the winter ___
A,came B.will come C.was coming,选哪个为什么
答案
C.was coming表将要来临
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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