单项选择题

Only when in danger（）human beings.

A．will attack most snakes
B．will most snakes attack
C．snakes will most attack
D．most snakes will attack

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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．kept
C．be kept
D．to keep
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
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