Television and radio to know what is going on all over the world
题目
Television and radio to know what is going on all over the world
A.made it possible of us
B.have made us possible
C.have made it possible for us
D.have made it be possible for us
请说明理由
答案
C 现在完成时强调对现在的影响,排除A,而MAKE +宾语+形容词,‘让……’）
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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