问题
选择题
People today make choices of their diets______ what they believe.
A．based on
B．basing on
C．are based on
D．being based on
答案
答案：A
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。