[单选题]Which is true according to the passage?
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2023-10-01 08:02:59
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[单选题]Which is true according to the passage?

A.It is regulated that the customers must pay a tip if they want to get good service.
B.There exists the tipping custom in each country.
C.In some countries, tipping has become an industry.
D.More and more people are in favor of tipping.
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