铅蓄电池的两极分别为Pb、PbO₂，电解质溶液为H₂SO₄，工作时的反应为 Pb＋PbO₂＋2H₂SO₄＝2PbSO₄＋2H₂O，下列结论不正确的是 [ ]

A.Pb为负极被氧化

B.外电路有2mol电子转移时，负极消耗 SO₄^2-为2 mol

C.溶液的pH不断减小

D.电解质溶液pH不断增大

--- Bad luck! It’s too late.

--- It doesn’t matter. The concert       for only a few minutes. You can’t miss it.

A．has begun

B．has been on

C．began

D．lasted