单选题People today make choices

问题补充：

单选题Peopletodaymakechoicesoftheirdiets______whattheybelieve.A.based onB.basing onC.are based onD.being based on

答案：

A解析考查短语：be based on 以什么为基础，在这里based on做后置定语，修饰their diets，相当于定语从句which are based on，故选A。