单项选择题

The football player had studied economics in the university for ______ of roughly six years.

A．a decade
B．a time
C．an age
D．a period
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A．NeitherB．NeverC．EitherD．Whether
A．Neither
B．Never
C．Either
D．Whether
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A．observationB．captureC．phenomenonD．process
A．observation
B．capture
C．phenomenon
D．process
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