定语从句 Sugar-free gum and candy______the sweetener xylitol sho

应填containing,这不是定语从句问题,也不是省略问题.
sugar-free gum：无糖香口糖,无糖香口胶
candy containing the sweetener xylitol ：含甜味剂木糖醇的糖果
candy（containing the sweetener xylitol ）括号内是定语
Sugar-free gum and candy containing the sweetener xylitol 是并列主语,意思是“ 无糖香口糖和含甜味剂木糖醇的糖果”