单项选择题

If _______in the fridge, the fruit can remain fresh for more than a week.

A． keeping
B． be kept
C． kept
D． to keep
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I haven't met him _______the last committee meeting.
A． for
B． since
C． at
D． before
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The criminal didn't realize the value of freedom _______he had lost it.
A． if
B． as
C． while
D． until
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