关于play an important roleboth A and B　plays an important role in today's society.总感觉有点怪,both后有A 和 B 后面是play an!important role.不知道这种情况怎么处理,难道有play important roles?感觉略怪

关于play an important role
both A and B　plays an important role in today's society.总感觉有点怪,both后有A 和 B 后面是play an!important role.不知道这种情况怎么处理,难道有play important roles?感觉略怪

both A and B　play an important role是对的,play的单复数形式由它前面的主语决定,由于前面是both A and B所以要用复数