Having a good diet is of great importance to keeping healthy.
题目
Having a good diet is of great importance to keeping healthy.
为什么要用keeping,to不是要跟原型吗?、、
答案
Having a good diet is of great importance to keeping healthy.
这边的to不是不定式的to,而是介词的to,所以后面要用ing形式
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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