单项选择题

Every person's usual temperature varies ______ the time of days.

A．from
B．in
C．to
D．with
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单项选择题
There is no point ______ it again to him, for he never listens to our advice.
A．saying
B．to say
C．say
D．said
单项选择题
The key ______ success is hard work and persistence.
A．on
B．to
C．of
D．into
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