单项选择题


A．since
B．after
C．when
D．before
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单项选择题
A．ordinaryB．necessaryC．harmlessD．practical
A．ordinary
B．necessary
C．harmless
D．practical
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
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