This is the problem _____ at the next meeting.

A．to discussing

B．to be discussed

C．discussed

D．being discussed

取硫酸阿托品2.0g，盐酸吗啡4.0g，配制成注射液200mL，需加入氯化钠多少克，才能使之成为等渗溶液（）

A.0.24

B.0.48

C.4.8

D.0.94

E.9.6