He kept______how things were going on in the earthquake areas.
题目
He kept______how things were going on in the earthquake areas.
A.informed us of B.informing us of C.us informing of D.informing on
答案
正解应该是He kept us informed of how things were going on in the earthquake areas.
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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