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

问题补充：

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

A. where

B. when

C. that

D. whose

答案：

(答案→)A. where

B. when

C. that

D. whose

解析：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。