单项选择题


A．ordinary
B．necessary
C．harmless
D．practical
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单项选择题
A．the one of a professorB．that of a professorC．a professorD．that of a professor's
A．the one of a professor
B．that of a professor
C．a professor
D．that of a professor's
单项选择题
A．in the pastB．sometimesC．not yetD．for some time
A．in the past
B．sometimes
C．not yet
D．for some time
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