— Hello, I ____ you ____ in London, how long have you been here?   

— I came here last week.  [ ]

A. don't know; were    

B. didn't know; were

C. haven't known; are  

D. hadn't known; are  

玻璃体手术中治疗复杂视网膜脱离，硅油填充时眼压控制在______即可。