Miss Jones _______ music at Bardon School for five years when she was abroad and now

she is an actress.[ ]

A. taught        

B. has taught        

C. had taught        

D. has been teaching

在药品价格管理中，医疗机构必须执行并不得擅自提高价格的药品是（）

A.企业定价

B.企业指导价

C.市场调节价

D.政府指导价

E.政府定价、政府指导价