下列哪项不属于生物精神病学研究的范畴（）

A.社会文化与精神疾病

B.精神疾病的神经生化基础

C.精神药物治疗学

D.精神疾病遗传学

E.神经放射学研究精神疾病

The steel works in which David has worked for five years       us with raw material in large quantities in the past two years. [ ]

A.has been supplying

B.was supplying

C.have been supplying

D.were supplying