单项选择题

[听力原文]
W: How much do I pay each month for your network service
M: It depends on how many hours you use. Each hour costs $1.50.
How much will the woman pay if she uses 20 hours（）

A．$30.
B．$20.
C．$15.
D．$12.

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[听力原文] W: How much do I pay each month for your network service M: It depends on how many hours you use. Each hour costs $1.50. How much will the woman pay if she uses 20 hours（） 您的浏览器不支持 audio 元素。