_____the film so many times , I don’t need to see or hear it___what is happening now on the screen .

A．Seeing ; knowing

B．Having seen ; to know

C．To have seen , to know

D．To see , to know

对于孕妇晚期梅毒的治疗应首选

A．红霉素

B．喹诺酮类

C．青霉素

D．头孢类抗生素

E．甲硝唑