I was surprised at ---- offering help
题目
I was surprised at ---- offering help
A his offering
B him offering
选哪个,为什么
答案
A his offering
这里是让你填名词,him offering 就只是一件事情,是个名词所以A
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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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