单项选择题

A．used not
B．not used
C．used
D．is used
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单项选择题
Why did the government appoint a board of grain supervisors in 1917
A．To meet the farmers’ request for firmer control.
B．To hold back inflation and rising living costs.
C．To fix the grain prices so that the farmers could be better rewarded for their work.
D．To establish a full authority to buy, sell and set prices.
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