In an economy income per head used to rise by barely 1% a year current growth rates feel

问题补充：

In an economy income per head used to rise by barely 1% a year, current growth rates feel like a miracle.

A. when

B. whose

C. that

D. where

答案：

A. when

B. whose

C. that

(答案→)D. where

解析：考查定语从句。先行词为economy，它在定语从句中起状语的作用，表示“在经济体中”，所以用关系副词where引导定语从句。在一个过去人均年收入增长只有l%的经济体中，当前的增长速度如同奇迹一般。