Does Liu Hui serve in the army?No,but he ___in the army for three years.A.servedB.has servedC.is servingD.would serve选哪个,为什么?

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DoesLiuHuiserveinthearmy?No,buthe___inthearmyforthreeyears.A.servedB.hasservedC.isservingD.wouldserv

Does Liu Hui serve in the army?No,but he ___in the army for three years.A.servedB.has servedC.is servingD.would serve选哪个,为什么?
Does Liu Hui serve in the army?No,but he ___in the army for three years.
A.servedB.has servedC.is servingD.would serve选哪个,为什么?

Does Liu Hui serve in the army?No,but he ___in the army for three years.A.servedB.has servedC.is servingD.would serve选哪个,为什么?
B
现在完成时,表示对现在的影响,指现在不用服兵役了

b for _+时间段用现在完成时

选择C呀