问题详情

Why is the end of bidding called "knocking down"？

A．Because the auctioneer knocks on the table.

B．Because the auctioneer names the highest bidder as the buyer of the goods.

C．Because the goods are knocked down onto the table.

D．Because the auctioneer bangs the table with a hammer.

请帮忙给出正确答案和分析，谢谢！