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
They are well ______ with each other since they once studied in the same university
A．informed
B．accustomed
C．acknowledged
D．acquainted
单项选择题
If you want this pain killer, you have to ask the doctor for a ______.
A．recipient
B．reception
C．subscription
D．prescription
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