单项选择题

When is it cheaper to make an international call

A．10 a.m.
B．5 p.m.
C．11 p.m.
D．8 a.m.
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单项选择题
If you want to use your Business Telecard International, you have to
A．use a card phone
B．phone on Sunday
C．make a direct dialing call
D．pay extra
单项选择题
What is the most expensive type of call
A．Direct dial.
B．Through the operator.
C．Reverse charge call.
D．Calling outside office hours.
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