(单选题)6: 设x(n)是输入序列，y(n)是输出序列，则下列属于因果系统
的是( )。
A: y(n)=x(n+2)
B: y(n)=cos(n+1)x(n)
C: y(n)=x(2n)
D: y(n)=x(-n)
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