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
An old friend from abroad, ______ I was expecting to stay with, telephoned me from the airport.
A．that
B．whom
C．as
D．which
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