单项选择题

A．At 9:15.
B．At 9:35.
C．At 9:50.
D．At 9:20.
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单项选择题
From the last sentence of the first paragraph we learn that ______ .
A．in the future all the Americans will use credit cards
B．credit cards are mainly used in the United States today
C．nowadays many Americans do not pay in cash
D．it is now more convenient to use credit cards than before
填空题
According to
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