If you had joined the chat room ten minutes ago, you _____ what we were talking about.

A．will know

B．are knowing

C．can know

D．would have known

医院Ⅱ类环境是（）

A.重症监护病房

B.妇产科检查室

C.层流洁净病房

D.医院职工餐厅

E.传染病房