I know that Bob is not much of a football player , but when ________ to maths, he is among the top three in class.
A.he refers
B.it es
C.he leads
D.it concerns
网友回答
B解析【巧解导析】四个选项中，refer to表示“谈到，提到，查询”；when it es to为固定句式，表示“至于，谈到”；lead to表示“通向，导致”；concern表示“关心”，常用be concerned with/about结构．