---Does your brother serve in the army?

---No, not now. But he ________ in the army for 8 years.

A．would serve

B．was serving

C．had served

D．served

我国各地的“一县一品”、“一镇一品”反映的是[ ]

A．工业联系

B．工业转移

C．工业集聚

D．工业的专业化产业区