He does (更擅长)at doing maths problems than 如何填写
问题描述：
He does (更擅长)at doing maths problems than 如何填写
He does (更擅长)at doing maths problems than 如何填写
不是，答案是even better。我现在不明白此短评是be good at doing,但是前面为什么是do呢，而不是be的形式呢？
答
句子可以这样看 He does even better (at doing maths problems) than I.
这里不是be good at的应用,at在这里指“在.方面”,句子翻译为“他比我更擅长做数学题”