单项选择题

A．Meeting with his professors.
B．Doing extra work in the chemistry lab.
C．Writing papers for his classes.
D．Working overtime as a librarian.
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单项选择题
A．They missed the concert because of the rain.B．They are soaked in the rain on their way to the concert.C．They will dry off their clothes immediately before the concert starts.D．They will change their clothes a few minutes before the performance starts.
A．They missed the concert because of the rain.
B．They are soaked in the rain on their way to the concert.
C．They will dry off their clothes immediately before the concert starts.
D．They will change their clothes a few minutes before the performance starts.
填空题
By manipulating ___________ in the country, the Fed can influence the economy in a positive or negative way.
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