—We'll go to the party to be held in Qinghai Grand Theater at 8 tonight. Could you join us?

—I'm afraid I can't. I ________ the holiday plan with my friends.

A．am discussing

B．have discussed

C．will be discussing

D．will have discussed

可用滴制法制备、囊壁由明胶及增塑剂等组成( )。

A．微丸
B．微球
C．滴丸
D．软胶囊
E．脂质体