单项选择题

Questions 23 to 25 are based on the conversation you have just heard.

A. Bills.B. Identity cards.C. Photos.D. Visa.

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For a customer, if calling a carrier’s customer-service number right now is not effortless, it is often ______.

单项选择题

Questions 23 to 25 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。