The kind-hearted man,who thinks ___ his duty to help poor people ,is popular with many people who kn
题目
The kind-hearted man,who thinks ___ his duty to help poor people ,is popular with many people who know him
A it
B that
C one
D this
答案
A it是形式宾语代替后面的to help poorpeople
think it one's duty to do sth
认为干某事是某人的责任
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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