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It is ten months since he   a doctor.(  )A.becomes B.became C.has become D.had become

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long  heavy  old  young  
that  when  since  while  
before  when  since  that  
hard; harD.    hardly; hardly    hard; hardly    hardly; hard  
is    has    will    was  
Ten years went by    Ten years has passed    It is ten years ago    There are ten years  
is    has    will    was  
for, married    since, married    for, was married    since, was married  
hard ,hard    hardly, hardly   hard ,hardly    hardly, hard  
Since    Besides    Though    As long as  
had worked  is working  worked  has worked  
when  that  since  after  
when  that  since  after  
when    before    since    that  
when  before  since  that  
when    before    since    that  
hard, hard   hardly, hardly  hard, hardly  hardly, hard  
is  has  will  was  
when    before    since    that  

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