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output signed [7:0] y;input signed [7:0] a;assign y=(a2);若a=10101011,则输出y等于:

output signed [7:0] y;input signed [7:0] a;assign y=(a2);若a=10101011,则输出y等于:
A.00101010
B.10101100
C.11101010
D.10101111
正确答案:11101010