单项选择题

19（）

A．to
B．at
C．of
D．on

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单项选择题
The main purpose of this article is （）.

A. to introduce the soft drink Coca-Cola to readers.
B. to trace the history of the company's first hundred years.
C. to sum up the causes of Coca-Cola's Success
D. both B and C.
单项选择题
During the business day, you will most likely be offered ______.

A． food
B． coffee
C． milk
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