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．Outside office hours.

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单项选择题
If you want to make a cheaper daytime call, you should （）

A．call on Monday
B．ask the operator to pay some money
C．keep waiting
D．phone on a Sunday
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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