单选题 Questions 50-52 refer to the following letter.
I appreciate you for purchasing a product from our catalog. We hope you are satisfied with your purchase of our quality merchandise.
Please examine the contents of this package (50) upon receipt to make sure that your order has arrived (51) . In the event that you are not totally satisfied with your purchase for any reason, you can return it to us within thirty days for a full refund, no questions asked. Just repack it in the same box you (52) , and apply the enclosed return shipping label to the outside of the box. Return postage will be paid by us.
If you wish to return a product after thirty days from the purchase date, please call the customer service office at 800-252-NEED and ask to speak with a customer service representative.

【正确答案】 D
【答案解析】upon receipt指“一收到立刻”。这里immediately(即刻)是最合适的,表示“一收到货物就立刻确认”。
【正确答案】 A
【答案解析】这里要和前面一句连起来看。要“立刻确认”的事情是,货物是否“原封不动地”、“完好地”送到了。
【正确答案】 D
【答案解析】box和you之间省略了关系词。因此空格内应填入带有谓语动词的、不带宾语的不完整句子。A选项中received没有宾语,in也没有宾语,不完整过头了。不完整的部分只要一个就可以了。B选项不是谓语动词,C选项以和A选项以相似的理由被排除。正确答案是D选项。