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
In the last few minutes the conversation has become seemingly （）as if the discussion were of some minor domestic matte r and not survival itself.

A. crucial
B. central
C. casual
D. causal
单项选择题
He couldn’t（）his curiosity to see what was in the box.

A. retain
B. restrain
C. restrict
D. represent
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