According to the United Nations an aging society refers to one 10 percent or more of the

问题补充：

According to the United Nations, an aging society refers to one 10 percent or more of the population is over 60, or 7 percent or more is over 65.

A. where

B. when

C. which

D. that

答案：

(答案→)A. where

B. when

C. which

D. that

解析：这题考查定语从句的用法，先行词是one代指an aging society“一个老龄化社会”，定语从句中不缺主语，宾语，表语，所以填where。

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