He many books for his little brother ,so he could read them at home
题目
He many books for his little brother ,so he could read them at home
A.gave B.bought C.took
答案
B
buy sth.for sb.固定搭配
而另两个是
give sth.to sb.
take sth.to sb.
而且句意也是 买
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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