单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A. A bank teller and a patron.
B. An accounts manager and a customer.
C. A sales clerk and a shopper.
D. A stock broker and a client.

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问答题

Questions 19 to 21 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。