he has been a soldier for three years.改为同义句:It is three years --------- ---------- ---------the army.

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he has been a soldier for three years.改为同义句:It is three years --------- ---------- ---------the army.
he has been a soldier for three years.改为同义句:It is three years --------- ---------- ---------
the army.

he has been a soldier for three years.改为同义句:It is three years --------- ---------- ---------the army.
It is /has been three years since he became a soldier.
固定句型:It is /has been +一段时间+since.不管是用is还是has been ,since从句都用过去时

since he joined the army

since he joined