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.
A.$30. B.$20. C.$15. D.$12.
A. mustn't have arrived B. shouldn't have arrived C. can't have arrived D. need not have arrived
A. has been reading B. had read C. is reading D. read