单项选择题1943年7月12日，在普罗霍罗夫卡城下，德军和苏军爆发了迄今为止人类战争史上最大规模的坦克大会战。
单项选择题The buyer is satisfied with the goods, so they place another order for the same products, but the terms and conditions are different. So we can conclude it’s a an___ order. A. repeatB. duplicateC. initialD. regular
