单项选择题

Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage. Tipping became popular in America ______.

A．in the Independence War
B．after the Civil War
C．by the turn of the century
D．in the 1960s

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单项选择题

单项选择题

Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage. Tipping became popular in America ______. 您的浏览器不支持 audio 元素。