-Why does the Lake smell terrible?

-Because large quantities of water           .[ ]

A. have polluted  

B. is being polluted  

C. has been polluted  

D. have been polluted

某患者大面积烧伤，伤口坏死组织多，你应首先采取以下哪种方法给予处理

A．清创，扩创，注射TAT
B．清创，扩创，注射DPT
C．清创，扩创，注射OT
D．简单处理伤口以便减少患者的疼痛
E．立即注射大剂量链霉素