单项选择题

A candle used to burn at auction sales ______.

A．because they took place at night
B．as a signal for the crowd to gather
C．to keep the auctioneer warm
D．to limit the time when offers could be made
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单项选择题
A knock out is arranged ______.
A．to keep the price in the auction room low
B．to allow one dealer only to make a profit
C．to increase the auctioneer's profit
D．to help the auctioneer
单项选择题
Examining bottles of wine is hard work because ______.
A．the bottles must be held upside down
B．it is difficult to see the particles of dirt
C．it requires high level of automatic
D．most bottles are all right
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