In the reaction $HNO_3 + H_2O \rightleftharpoons H_3O^{+} + NO_3^{-}$,the conjugate base of $HNO_3$ is = .......
- A$H_2O$
- B$H_3O^{+}$
- C$NO_3^{-}$
- D$H_3O^{+}$ and $NO_3^{-}$
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