I'm not good ____ math so I usuaiiy spend a lot of time____ it.
问题描述：
I'm not good ____ math so I usuaiiy spend a lot of time____ it.
A at;inB in;on C at;on Dat ;for
要说为什么哦
答
at on
be good at 擅长于……
spend time on 花时间于……