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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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
单项选择题
I think it's high time we ______ strict measures to stop pollution.
A．will take
B．take
C．took
D．have taken
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