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单项选择题
A．Twenty years.B．Forty years.C．Sixty years.D．Eighty year.
A．Twenty years.
B．Forty years.
C．Sixty years.
D．Eighty year.
单项选择题
A．Correspondence schools conduct the students by mail.B．Correspondence schools conduct the students by radio.C．Correspondence schools conduct the students through TV programs.D．Correspondence schools conduct the students by telephone.
A．Correspondence schools conduct the students by mail.
B．Correspondence schools conduct the students by radio.
C．Correspondence schools conduct the students through TV programs.
D．Correspondence schools conduct the students by telephone.
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