甲、乙、丙、丁分别是NaCl、Ba(NO3)2 、Na2CO3、HCl四种溶液，已知甲和

甲、乙、丙、丁分别是NaCl、Ba(NO₃)₂、Na₂CO₃、HCl四种溶液，已知甲和乙可以反应，甲和丁也可以反应，则下列说法正确的是（）

A．丁不可能是Ba(NO₃)₂ B．甲一定是Na₂CO₃

C．丙一定是盐酸 D．甲一定是NaCl、

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甲、乙、丙、丁分别是NaCl、Ba(NO3)2 、Na2CO3、HCl四种溶液，已知甲和

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