单项选择题

______ the teacher's help, he has made great progress.

A．At
B．Under
C．With
D．On
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单项选择题
Mr Green went home ______ Christmas, the children had a good time ______ Christmas Eve.
A．on, on
B．at, on
C．in, in
D．at, at
单项选择题
He did the work ______ the best of his ability.
A．for
B．with
C．to
D．on
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