单项选择题

A．Their poor life.
B．Their schoolwork.
C．Their mountain schools.
D．Their schooling.
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maintains
单项选择题
A．By talking to everybody.B．By studying American history.C．By putting a number on it.D．By making a guess at this.
A．By talking to everybody.
B．By studying American history.
C．By putting a number on it.
D．By making a guess at this.
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