单项选择题


A．the one of a professor
B．that of a professor
C．a professor
D．that of a professor's
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单项选择题
A．chooseB．workC．masterD．think
A．choose
B．work
C．master
D．think
单项选择题
A．they areB．it isC．they haveD．there are
A．they are
B．it is
C．they have
D．there are
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