已知一个多位数的个位数字为m，且这个多位数的任何次幂的个位数

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已知一个多位数的个位数字为m，且这个多位数的任何次幂的个位数字仍为m，那么这个数字m ( )

A．可能是0和1

B．只能是0

C．只能是1

D．以上都不对

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