单选题 The old worker has been on the ______ in this factory for nearly 20 years.
【正确答案】 C
【答案解析】paypacket意为“工资袋”；payoff意为“还清债”；payroll意为“工资表”； payment意为“支付”。on the payroll是习惯搭配，意为“被雇佣”。