John is much better than I in playing chess.怎么不是at playing chess
问题描述：
John is much better than I in playing chess.怎么不是at playing chess
答
你好.答案是at
be good at doing sth ------擅长某事
但是
John does much better than I inplaying chess 是对的.
do well in (doing) sth ------擅长某事