i know that bob is not much of a football player,but when it__to maths,he is among the top three in the class.a,refers b,goes c,comes d,concernsbe much of

i know that bob is not much of a football player,but when it__to maths,he is among the top three in the class.a,refers b,goes c,comes d,concernsbe much of
i know that bob is not much of a football player,
but when it__to maths,he is among the top three in the class.
a,refers b,goes c,comes d,concerns
be much of

i know that bob is not much of a football player,but when it__to maths,he is among the top three in the class.a,refers b,goes c,comes d,concernsbe much of
C comes to 来到,轮到
其他成绩不好,但当轮到数学时,他就是前三
be much of 是个词组解释为 是个好的,是个很好的
但更确切的用法是
much of a (常用于疑问句或否定句)了不起的 ...
如：
He's not much of a cricketer.
他算不上好板球手.
His brother is not much of a companion for him.
他兄弟与他情趣不甚相投.
I find this town too much of a backwater.
我觉得这个城镇太闭塞.

c
大概，表推测

comes
"comes to"
concern 或许还可以，但是不说concern to

C.much of 类似于be good at，come to 是谈及---话题！
句子意思：我知道bob不善于踢足球，但是谈及数学，他是他们班的前三名！