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For a large bulk contract _______ commodities to be delivered over a fairly long period of time, the agent's _______ may be under 1%.
A、of,account
B、about,income
C、on, payment
D、for,commission
【正确答案】：D
【题目解析】：句意：对于大宗商品的合同，在相当长的一段时间内交付，代理商的佣金可以低于1%。