单项选择题

A．extension
B．spread
C．expansion
D．explosion
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单项选择题
A．contributedB．creditedC．identifiedD．brought
A．contributed
B．credited
C．identified
D．brought
单项选择题
A．contributedB．attributedC．distributedD．owned
A．contributed
B．attributed
C．distributed
D．owned
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