英语 形式主语
题目
英语 形式主语
求,英语以it开头的形式主语的练习
答案
it is difficult to tell the differences.真正主语是后面的不定式to tell the differences
it is kind of you to help others.真正主语：to help others
it is said that the food is good for health.真正主语:that the food is good for health.
it is popular to keep fit by Yogu.真正主语：to keep fit by Yogu
这些都是it 为形式主语的句子.
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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