国家开放大学 / 综合英语（2）
正确率：100%
The author thinks that _ _ _ _ .
a. tipping can benefit greatly a country’s economic growth
b.tipping can ensure the quality of service a customer receives
c.tipping can improve a country’s cultural environment
d. tipping is not conductive tertiary industry
a. tipping can benefit greatly a country’s economic growth
b.tipping can ensure the quality of service a customer receives
c.tipping can improve a country’s cultural environment
d. tipping is not conductive tertiary industry
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