All of us didn't know     _________ when we got there.[ ]

A. how to do

B. what to do

C. why to do

A．磺胺嘧啶 B．甲硝唑 C．甲氧苄啶 D．诺氟沙星 E．甲磺灭脓

被称为磺胺增效剂的是（）

A．磺胺嘧啶

B．甲硝唑

C．甲氧苄啶

D．诺氟沙星

E．甲磺灭脓