【题目】Dunhuang used to be a marketplace _____everybody came and were able to purchase silk, tea, porcelain(瓷器)…
A. which B. that C. when D. where
在线课程【答案】D
【解析】
试题分析：考察定语从句引导词。定语从句中的先行词是marketplace市场，是一个地名，所以要用关系副词，故选D该句意思为：敦煌过去是一个每个人都能过来并且能够买丝绸、茶叶和瓷器的地方。故选D