---You____ part in the party on time.

--- Sorry, I was delayed by the accident.

A．are supposed to take

B．have supposed to take

C．are supposed to have taken

D．supposed to take

能促进药物吸收并起到缓释与延效作用的是（）。

A．可可豆脂 

B．甘油明胶 

C．硬脂酸 

D．泊洛沙姆 

E．羊毛脂