单项选择题

Questions 19～22 are based on the following passage.
Which people are usually not allowed to use the stacks

A．Library employees.
B．Graduate students.
C．Undergraduate students.
D．Professors.

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单项选择题

单项选择题

Questions 19～22 are based on the following passage. Which people are usually not allowed to use the stacks 您的浏览器不支持 audio 元素。