单项选择题

The possibility that the explosion was caused by sabotage cannot be ______.

A．broken out
B．cancelled out
C．ruled out
D．wiped out
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单项选择题
The very biggest and most murderous wars during the industrial age were intraindustrial-wars that ______ Second Wave nations like Germany and Britain against one another.
A．pitted
B．drove
C．kept
D．embarked
单项选择题
Danis Hayes raised the essential paradox and asked how people could have fought so hard against environmental degradation ______ themselves now on the verge of losing the war.
A．only found
B．finding only
C．only to find
D．have only found
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