单项选择题

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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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
单项选择题
The grain output of this year is much higher than ______ of last year.
A．that
B．such
C．which
D．what
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