How did it ______ that all the flowers died?I had forgotten to water them.应选什么?
题目
How did it ______ that all the flowers died?I had forgotten to water them.应选什么?
A.come about B.come back C.come on D.come down
答案
选A.come about,是发生的意思!
意为：所有的花怎么会死呢?
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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