单项选择题

A．disadvantage
B．challenge
C．advantage
D．privilege
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单项选择题
A．exploitedB．importedC．receivedD．specified
A．exploited
B．imported
C．received
D．specified
单项选择题
A．becauseB．beforeC．sinceD．when
A．because
B．before
C．since
D．when
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