—Does Li Ping serve in the army?
—No, but he in the army for five years.
A. served
B. has served
C. is serving
D. would serve
网友回答
(答案→)A. served
B. has served
C. is serving
D. would serve
解析：由答语No可知他现在不在部队服役，是以前“服过役”，故用一般过去时。千万不要被时时状语for three years所迷惑，而错选答案B。