单项选择题

Questions 11 to 18 are based on the conversation you have just heard

A．Disconnect his telephone.
B．Blow a whistle into the receiver.
C．Keep a record of incoming annoyance calls.
D．Report his problem to the police.

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Questions 11 to 18 are based on the conversation you have just heard 您的浏览器不支持 audio 元素。