John joined the army three years ago.(用since或for改写) 怎么写.

John joined the army three years ago.(用since或for改写) 怎么写.
英语人气:880 ℃时间:2019-08-19 17:09:15
优质解答
John has been in the army for three years.
John has been in the army since three years ago.
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