单项选择题

A．Take a class together with Mary.
B．Ask Mary to help him choose a topic.
C．Change the topic of his research project.
D．Sign up for a different political science course.
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填空题
these computers record which hours are busiest and which employees are the most efficient, allowing personnel and staffing assignments to be made accordingly [Main Points]these computers record which hours are the busiest and which employees are the most efficient, allowing personnel and staffing assignments to be made accordingly
填空题
reorder
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