改成同义句:They have known each other for six years .They have known each other ____six years____.

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改成同义句:Theyhaveknowneachotherforsixyears.Theyhaveknowneachother____sixyears____.改成同义句:Theyhaveknownea

改成同义句:They have known each other for six years .They have known each other ____six years____.
改成同义句:They have known each other for six years .
They have known each other ____six years____.

改成同义句:They have known each other for six years .They have known each other ____six years____.
since; ago