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----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

----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

----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