下列离子方程式正确的是

A．NH₄HCO₃溶液与KOH溶液混合，且n(NH₄HCO₃)/n(KOH)＝5:8

3NH4⁺＋5HCO₃^—＋8OH^－→5H₂O＋5CO₃^2—＋3NH₃·H₂O

B．Ba(OH)₂溶液与少量KHCO₃溶液反应：Ba²⁺＋2OH^－＋2HCO₃^—→BaCO₃↓＋2H₂O＋CO₃^2—

C．把FeO固体投入到稀HNO₃中：FeO＋2H^＋→Fe^2＋＋H₂O

D．用Pt电极电解MgCl₂溶液：2Cl^－＋2H₂OH₂↑＋Cl₂↑＋2OH^－

I’ll go to bed as soon as my homework______.

A．do

B．does

C．are done

D．is done