药物非临床安全性评价机构必须遵守

A．处方药与非处方药
B．C批准上市药品
C．毒麻药品
D．传统中药
E．新药

-Are you a teacher?

-No,but I__________.[ ]

A. used to be                  

B. used to

C. would be                        

D. would