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单项选择题Which one of the following solutions can be accurately titrated by acid-base titration method ( )

A．0.1 mol/L HF (pKa = 3.18)
B．0.1 mol/L HCN (pKa = 9.21)
C．0.1 mol/L NaAc [pKa(HAc) = 4.74]
D．0.1 mol/L NH4Cl [pKb(NH3) = 4.75]

单项选择题3、 A、A B、B C、C D、D