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My parents have got married since 1992. They have known each other well for quite a long timE. We haven’t heard from Jack since two weeks ago. It has been ten years since he joined the cluB.
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have been known to scientists for many years have only recently been discovered are known by us will probably remain a mystery
has left has been away from have been away has been left
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When; left When; has been away How long; has left How long; has been away
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