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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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 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.
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