---Did you remember to give Jane the money you owned her?

---Yes, I gave it to her_________ I saw her.

A．while

B．the moment

C．suddenly

D．once

影响北京地区空气质量的气体污染物主要是（　　）

A．CO₂、O₂、N₂

B．SO₂、NO₂、CO

C．CH₄、CO₂、SO₂

D．HCl、CO₂、N₂