下列物质的化学式书写正确的是（　　）

A．四氧化三铁O₄Fe₃

B．氮气N

C．氯化铁FeCl₂

D．氖气Ne

－Oh, it’s you, Steve! I ______ you.

　 －No surprising. I’ve just had my hair cut.

A．don’t recognize

B．haven’t recognized

C．didn’t recognize

D．hadn’t recognized