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函数f (x)为奇函数且f (3x+1)的周期为3,f (1)=-1,则f (2006)等于( )
A.0 B.1 C.一1 D.2
函数f(x)为奇函数且f(3x+1)的周期为3,f(1)=-1,则f(2006)等于
A.0
B.1
C.一1
D.2
C.-1