They have made much progress__(用）their hard work.
题目
They have made much progress__(用）their hard work.
答案
They have made much progress__(用）their hard work.
这个“用”,是“以.的方法”,with
如：With the help of the computer we can do lots of things.
用了电脑,我们可以做许多事（在电脑的帮助下）
by也可以是“以...”、“通过...”,by doing更常用,with sth.更常用
本句中their hard work是个名词,所以用with比by更好
但如果是asking often and learning,就用by更好
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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