My uncle_________ in the amy for three years.A.has joined B.has served谁知道答案,理由?

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Myuncle_________intheamyforthreeyears.A.hasjoinedB.hasserved谁知道答案,理由?Myuncle_________intheamyforthre

My uncle_________ in the amy for three years.A.has joined B.has served谁知道答案,理由?
My uncle_________ in the amy for three years.
A.has joined B.has served
谁知道答案,理由?

My uncle_________ in the amy for three years.A.has joined B.has served谁知道答案,理由?
B
意思是,我舅舅已经服军役三年了
选A的话,要用had