问题：
[单选题]49如反应板上包被某抗体,用一步法(标记抗原与标本同时加入)测某抗体时,如标本中含相应抗原,则结果出现( )
A、假阳性
B、假阴性
C、前带反应
D、后带反应
E、无影响
参考答案：
A
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