Arthur spends all his free time < > his grandson
题目
Arthur spends all his free time < > his grandson
答案
Arthur spends all his free time his grandson
作家把他的空余时间都花在了他的孙子身上
这里是个短语：spend some time /money on sth
等于
spend some time/ money in doing sth
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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