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
Exercise is good ______ the health, the teacher is very good ______ these children.
A．for, to
B．at, at
C．to, for
D．with, with
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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