下列一定能实现的变化是( )A.X2+H2O====HX+HXO(X=Cl、F)B.M+S MS(M=Fe、Cu)C.A+H2SO4(浓)AO2(A=C、S)D.M+ H2SO4(浓)→MSO4+SO2↑+H2(M=Fe、Cu)
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