Had it been possible, I would have gone to attend Monica in the hospital, but I  fully occupied last month.

A．had been

B．was

C．am

D．have been

可溶性钡制剂为

A．易爆炸品
B．自燃及遇火燃烧的药品
C．易燃液体
D．极毒品及杀害性药品
E．具有强烈腐蚀性的药品