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Ben was busy taking a training class.______we had to wait for himfor half an hour..(  )

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had    will have    have had    have  
friendly to   angry with   busy with   proud of  
Co-locatin  Trainin  Formin  Teamin  
had    will have    have had    have  
busy  safe  lucky  healthy  
had    will have    have had    have  
busy    safe    lucky    healthy  
will be taken    take    are taking    would take  
had  will have  have had  have  
had    will have    have had    have  
to take  taking   took  taken  
to take    taking    took    taken  
doesn’t take    not take    not taking    don’t take  
taking; not mentioning    to take; not to mention    for; not mention    with taking; without mentioning  
until  unless  while  if  
no, to take    no, taking    any, to take    one, taking