My cousin is good at English.A. is good for B. do well in C. does well in

问题补充：

My cousin is good at English.

A. is good for B. do well in C. does well in

答案：

解析：句意：我的表弟擅长英语，be ggood for 对···有好处，be good at = do well in ,主语是单数，故谓语动词用第三人称单数，故选C。