单项选择题


A．existed
B．discovered
C．created
D．manufactured
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单项选择题
A．attackedB．deletedC．wipedD．filled
A．attacked
B．deleted
C．wiped
D．filled
单项选择题
A．opportunityB．carelessnessC．accidentD．hand
A．opportunity
B．carelessness
C．accident
D．hand
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