Now he is a worker,but he once served in the army for 5 year
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Now he is a worker,but he once served in the army for 5 year.为什么用served,不用has served,once
once,是过去,曾经的意思
所以,只是描述他过去曾经在军队中服过役,所以用过去时.
这里没有强调已经,或者服役的状态一直延续到现在,所以不能用完成时
所以,只是描述他过去曾经在军队中服过役,所以用过去时.
这里没有强调已经,或者服役的状态一直延续到现在,所以不能用完成时
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