He sold his old car the other day and bought a __________ （new）

He sold his old car the other day and bought a __________ （new） the very next day.
【正确答案】：new one
【题目解析】：此句的意思是他卖了旧车，第二天买了辆新车。A后面一般要用单数可数名词，因为都是car，为避免和前面的重复用表示单数可数的one代替。