Question

Taobo is Asia's largest retail（零售的） network platform, ______ people can buy and sell many kinds of things．

1. A.
   where
2. B.
   when
3. C.
   that
4. D.
   whose

Answer 1

A
考查定语从句。根据先行词platform 在定语从句中作地点状语，可知应该用where="on" which。