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．whereB．whenC．whichD．that
A
這題考查定語從句的用法，先行詞是one代指an aging society“一個(gè)老齡化社會(huì)”，定語從句中不缺主語，賓語，表語，所以填where。
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