The conjugate base of phosphorus acid is $x$. The conjugate base of oleum is $y$. What are $x$ and $y$,respectively?
- A$H_2PO_4^{-}, H_2S_2O_7^{-}$
- B$H_2PO_4^{-}, HSO_5^{-}$
- C$H_2PO_3^{-}, HS_2O_7^{-}$
- D$H_2PO_3^{-}, HSO_4^{-}$
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