单项选择题

If（）in the fridge, the fruit can remain fresh for more than a week.

A．keeping
B．kept
C．be kept
D．to keep

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单项选择题
Can machines perform the same tasks（）

A．that man does
B．which man does
C．what man does
D．as man does
单项选择题
By the end of this month, we surely（）a satisfactory solution to the problem.

A．will be finding
B．will have found
C．are finding
D．have found
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