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若n是奇数,则被9除的余数是( )
A.0 B.2 C.7 D.8
A.0 B.2 C.7 D.8
若n为奇数,则7n+C7n-1+C7n-2+…+C7被9除得的余数是( )
A.0 B.2
C.7 D.8