一药为主，一药为辅，辅药能够提高主药功能的是（）。

A.归脾丸与人参养荣丸

B.乌鸡白凤丸与香砂六君子丸

C.舟车丸与四君子丸

D.暖宫丸与暖脐膏

E.六神丸与冰硼散

Your grandpa had lived here for 50 years before he moved to London, _____?       [ ]

A. was it            

B. did he        

C. had he        

D. hadn't he