单项选择题

He has ______ over a seminar for social psychologists.

A．subscribed
B．tangled
C．refrained
D．presided
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单项选择题
Winston Churchill firmly ______ his announced aim of winning the war.
A．adhered to
B．referred to
C．saw to
D．catered to
单项选择题
I should say he is not ______ a teacher as a scholar.
A．too much
B．very much
C．so much
D．as much
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