b=a==!a A.0; B1; C,2;D 3.b=a==!a A.0; B1; C,2;D 3.
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b=a==!a A.0; B1; C,2;D 3.b=a==!a A.0; B1; C,2;D 3.
b=a==!a A.0; B1; C,2;D 3.
b=a==!a
A.0; B1; C,2;D 3.
b=a==!a A.0; B1; C,2;D 3.b=a==!a A.0; B1; C,2;D 3.
先计算!a,之后逻辑判断==,结果肯定为0,最后是赋值语句,b=0.
所以选A