Oh，it’s you，my dear friend.I________you at first sight.Where have you been these years? [ ]

A．didn’t recognize  

B．hadn’t recognized

C．haven’t recognized  

D．don’t recognize

我国适用普通和最低两种税率的关税是（）。

A.出口关税

B.过境关税

C.进口关税

D.对物品征税