单项选择题

Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now, listen to the conversation.
The shop could exchange the product if the customer（）

A．makes no more complaints
B．can produce the receipt
C．is still unhappy with it
D．brings it back within a week

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Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now, listen to the conversation. The shop could exchange the product if the customer（） 您的浏览器不支持 audio 元素。