下列关于十八反、十九畏说法不正确的是（）

A.藜芦反人参

B.甘草反大戟

C.乌头反半夏

D.人参畏牵牛子

E.藜芦反细辛

   the old man    in this factory when he was young ?   [ ]

A. Did, used to work  

B. Does. Used to working      

C. Did, use to work   

D. Do, used to work