how far is it from your school to your home 里from your school to your home 做什么成分?理由?
题目
how far is it from your school to your home 里from your school to your home 做什么成分?理由?
答案
from your school to your home 做实际主语it做形式主语,由于真正的主语from your school to your home太长,放在句子开头会显得头重脚轻,故用it做形式主语代替from your school to your home,而把真正的主语放在句子...
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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