英语语法问题：Lao She is one of the writers who good
英语语法问题：Lao She is one of the writers who good at writing plays.这句话中的问号处应该用is还是are?从句中的谓语动词是以先行词为准还是以主句中的主语为准?（也就以先行词writers为准从句谓语动词用复数,还是以one为准从句谓语动词用单数?）