____to be practical,the new method is being accepted by more and more workers
题目
____to be practical,the new method is being accepted by more and more workers
A Having proved B Proving C Proved D Having been proved
选哪个 为什么?
答案
A
这个prove可以看做是歌系动词~（to be true的to be可以省略）
所以没有被动~~~~
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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