创伤性休克早期最常出现的酸碱失衡类型是

A．呼吸性碱中毒

B．代谢性碱中毒

C．代谢性酸中毒

D．呼吸性酸中毒

E．代谢性酸中毒合并呼吸性碱中毒

You don't know ______ I want to see you again. It's a year since I last saw you.[ ]

A. how soon  

B. how long    

C. how often      

D. how much