单项选择题

The boss's promise to increase the workers' pay was a ______ to union demands.

A．concession
B．recession
C．submission
D．commission
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单项选择题
Rogers was dismissed from the army for ______ disobeying an order.
A．virtually
B．deliberately
C．appropriately
D．literally
单项选择题
People from ethnic ______ often face prejudice a and discrimination.
A．scarcities
B．minorities
C．minimum
D．shortages
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