Having been told many times,he still didn’t know how to do it.为什么不是hasing been told
题目
Having been told many times,he still didn’t know how to do it.为什么不是hasing been told
答案
having 是动词have的现在分词,has是动词have的第三人称单数,因此没有hasing这个词.
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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