单项选择题


A．regulation
B．principle
C．principal
D．definition
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单项选择题
A．other thanB．rather thanC．in additionD．why
A．other than
B．rather than
C．in addition
D．why
单项选择题
A．contributedB．creditedC．identifiedD．brought
A．contributed
B．credited
C．identified
D．brought
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