----Does Liu Hua serve in the army?----No but he in the army for three years.A. servedB. h

问题补充：

----Does Liu Hua serve in the army?

----No,but he in the army for three years.

A. served

B. has served

C. is serving

D. would serve

答案：

(答案→)A. served

B. has served

C. is serving

D. would serve

解析：上句用一般现在时，下句回答用No，说明以前在军队服役，股答案用一般过去时。