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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单项选择题
There is no exception ______ this rule.
A．to
B．of
C．for
D．with
单项选择题
The achievements are ______ a great importance.
A．for
B．of
C．to
D．at
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