You agreed to allow us a discount of 15% on ___________of more than 75 units in your letter dated July 8.
A、allowances
B、negotiations
C、agreements
D、orders
【正确答案】：D
【名师解析】:根据题目内容，句子描述的是在7月8日的信中同意了在订单数量超过75个单位时给予15%的折扣。选项A "allowances"（津贴）, 选项B "negotiations"（谈判）, 选项C "agreements"（协议）, 选项D "orders"（订单）。结合上下文，"orders"是唯一与折扣和数量有关的选项，因此正确答案是选项D "orders"。
