单项选择题

Questions 17 to 20 based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now listen to the passage. When was sugar used widely

A．3,000 years ago.
B．In modem times.
C．Quite recently.
D．300 years ago.

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单项选择题

单项选择题

Questions 17 to 20 based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now listen to the passage. When was sugar used widely 您的浏览器不支持 audio 元素。