单项选择题

In the past ______ years, the economy has been growing owing to tax cuts and Federal Reserve interest rate cuts.

A．2
B．3
C．4
D．5
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单项选择题
There are new concerns about the ______ of the U. S. economic expansion.
A．duration
B．momentum
C．prospect
D．future
单项选择题
According to the report, the contest will last ______ days.
A．one
B．two
C．four
D．six
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