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单项选择题
A．Less than one year.B．Four years.C．Five years.D．More than five years.
A．Less than one year.
B．Four years.
C．Five years.
D．More than five years.
单项选择题
A．To imitate it.B．To use it from time to time.C．To ask for it.D．To hear it.
A．To imitate it.
B．To use it from time to time.
C．To ask for it.
D．To hear it.
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