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The volunteers were busy     the old people in the nursing home do some cleaning.(  ) A.help B.hel...

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where    which    whose    that  
most of them    more of which    most of whom    most of what  
neither    all    both    none  
is    are    was    were  
crowded traffic    crowded traffics    busy traffic    busy traffics  
neither    all    both    none  
everyone    all   someone     none  
visited    have visited    were visiting    had visited  
is  are  was  were  
neither    all    both     none  
am    was    were    should be  
calling   to call   called   is called  
took    was taken    were taken    takes  
kept busy doing    keep busy with doing    were kept busy doing   have been kept busy with  
was; would    were; would    was; should    were; should  

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