there are five pairs to choose from ,but i am at a loss which to buy
题目
there are five pairs to choose from ,but i am at a loss which to buy
there are five pairs______,but i'm at a loss which to buy.
choose from
为什么不能选for choosing
答案
to do sth 是不定式~表能力（能够） 目的~
有五双可以选择,我却不知道选哪双.
for doing sth 表“为了.”
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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