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
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
A．moveB．shakeC．touchD．wave
A．move
B．shake
C．touch
D．wave
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