devoted all his life to studying math when he was young为什么是studying?
题目
devoted all his life to studying math when he was young为什么是studying?
答案
devoted all his life to studying math
他一生都致力于研究数学
devote all one's life to doing,把一生都致力于做某事,动词要加ing,变为动名词.
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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