—Does Liu Hui serve in the army? —No but he in the army for three years. A. servedB. has

问题补充：

—Does Liu Hui 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：由no是对前句的否定可知现在不在部队服役，是以前“服过役”，故用一般过去时。