单项选择题

How many hours is Moscow ahead of London during the summer（）

A．2.
B．3.
C．4.
D．5.

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单项选择题
When is it cheaper to make an international call（）

A．10a.m.
B．5p.m.
C．11 p.m.
D．11a.m.
单项选择题
What can you do if the international line is engaged（）

A．Book a call.
B．Make a "person-to-person" call.
C．Call back outside office hours.
D．Keep on callin
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