单项选择题

A．mother-son.
B．Flatmates.
C．Teacher-Student.
D．Brothers.
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单项选择题
A．Badly built.B．Very dirty.C．In disorder.D．Very clean.
A．Badly built.
B．Very dirty.
C．In disorder.
D．Very clean.
单项选择题
A．Testing.B．Discussing.C．Lectures.D．Reading.
A．Testing.
B．Discussing.
C．Lectures.
D．Reading.
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