问题补充：
The Chinese government has made the Mid-autumn festival a national holiday, people will have a day off.
A. when
B. which
C. where
D. what
答案：
(答案→)A. when
B. which
C. where
D. what
解析：句意：中国政府让中秋节成为国家节日在这一天允许人们有一天的假期。这里是定语从句，先行词是national holiday，从句中缺少状语，故选A。
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