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As we have seen, the focus of medical care in our society has been shifting from curing disease to p...

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mustn’t have seen    can’t have seen    couldn’t see    needn’t have seen  
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Before have we never seen each other  Never before we have seen each other  Each other have We seen never before  Never before have we seen each other  
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from what we heard  all what we heard  to what we have heard  from what we have heard  

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