I told your friend how to get to the hotel,but perhaps I___have driven her there.

A．could

B．must

C．might

D．should

下列各组物质的水溶液相互混合，可发生化学反应且有气体生成的是（　　）

A．HCl、NaOH

B．Na₂CO₃、H₂SO₄

C．Ca（OH）₂、Na₂CO₃

D．KCl、H₂SO₄