have something done 与have sth.to be done 区别
题目
have something done 与have sth.to be done 区别
答案
have something done 指“做好了某件事”;如I have had my homework done.我已经把作业做好了.
have sth.to be done 指“有件事情要去做”.如I have one more paper to be typed.我还有张单子要去打出来.
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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