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We have known for a long time that the organization of any particular society is influenced by the d...

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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.  
knew   have known   had known   know  
have desired  have hoped  have looked forward to  have expected  
knew  have known  had known  know  
after    before    when    since  
a long time ago    for a long time    since a long time    after a long time  
when    since    after    before  
after    before    when    since  
long time   a long time   the long time   some long time  
didn’t know    havn’t known    don’t know    hadn’t known  
before   since   after   when  
stand  standing  stood  stands  
after    before    when    since  
after    since    when    before  
knowing   to know   having known   to have known  

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