The Yunof brand of tea ( ) entered the market in Norway only three year ago is already among the top five best-selling brands.

A. when

B. who

C. where

D. Which

【答案】D。定语从句中关系代词的考察。定语从句缺少主语，而先行词the Yunof brand of tea为物，因此关系代词选择D选项的which。“云南茶叶三年前才进入挪威市场，如今已经成为茶叶销售品牌前五。”