John is much better than I in playing chess.怎么不是at playing chess

题目

John is much better than I in playing chess.怎么不是at playing chess

答案

你好.答案是at
be good at doing sth ------擅长某事

但是
John does much better than I in playing chess 是对的.

do well in (doing) sth ------擅长某事