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
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单项选择题
What can you do if the international line is engaged
A．Ask the operator to call you back later.
B．Make a "person-to-person" call.
C．Call back outside office hours.
D．Walt and call again when the line is free.
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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