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It     three years since we made friends.

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have passed    has passed    passed    has past  
study    were studying    will study    have studied  
since; for    for; for    for; since    since; since  
were    have made    have been    have become  
while    before    since    until  
until    before    while    since  
until    before    while    since  
were    have made    have been    have become  
before    after    since    when  
since   for   until   after  
have studied    were studying    will study    study  
separated from  hear of  cared about  passed by  
were  have made  have been  have become
  
study    were studying    will study    have studied  
were    became    have been    have made  
since    for    until    after  
the one of three years ago    one three years ago    the one since three years    one from three years  

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