单选题 If you have not received ______ of your order within two business days, please contact our customer service center.
A. confirmation B. resignation
C. preparation D. expectation

【正确答案】 A
【答案解析】[解析] 解答此题的关键是快速把握整句的句意。没有收到和订购相关的确认信息时，联系顾客服务中心，分析句意可以得知空格处应为“订单确认书”。