单项选择题

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________for the credit card numbers of the buyers is a problem.
单项选择题
A．Because he reads too many books.B．To learn how to separate the important from the unimportant.C．To be well-informed.D．Because he always wastes his time.
A．Because he reads too many books.
B．To learn how to separate the important from the unimportant.
C．To be well-informed.
D．Because he always wastes his time.
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