单项选择题

Questions 18--21 are based on the following passage.
What do you know about the U.S. president

A．He is elected.
B．He is the highest army commander.
C．He is a public servant.
D．All of abov

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单项选择题

单项选择题

Questions 18--21 are based on the following passage. What do you know about the U.S. president 您的浏览器不支持 audio 元素。