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One large country keeps a single time zone for its whole width. That country is:

AChile
BCongo
CCanada
DChina
Answer & Solution
Correct answer: D. China
1. Most wide countries run several zones. 2. One official keeps only one for everyone. 3. That country is China. _Source: OpenStax Astronomy 2e, Chapter 4, Earth, Moon, and Sky._
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