[单选题,1.3分] —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
出自：河南理工大学—大学英语2
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[单选题,1.3分] —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
出自：河南理工大学—大学英语2