单项选择题

Questions 18～20 are based on a monologue about e-commerce. You now have 15 seconds to read Questions 18～20.
In 1998, the total value transacted in e-commerce was ______.

A．$ 680 000 million
B．$ 68 900 million
C．$ 68 900 billion
D．$16 890 billion

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First of all, successful language learners are ______.

单项选择题

Questions 18～20 are based on a monologue about e-commerce. You now have 15 seconds to read Questions 18～20. In 1998, the total value transacted in e-commerce was ______. 您的浏览器不支持 audio 元素。