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I know he hasn't finished the work, but_______, he's done his best.

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has written    wrote    had written    was writing  
at all    in all    after all    above all  
was reading    has read    read    had read  
has wrote    wrote    had written    was writing  
wrote; writes    had written; has written   was writing; has finished    has written; writes  
to have written    to be writing    having writing   writing  
was reading    has read    read    had read  
has written    wrote    had written    was writing  
was reading    has read    read    had read  
was writing, has finished    wrote, finished    wrote, has finished    had written, has finished  
was writing  wrote  has written  had written  
shouldn't    may not    can't    needn't  
was writing, has finished    wrote, finished    wrote, has finished    had written, has finished  
has written    wrote    had written    was writing  
shouldn't    may not    can't    needn't  
was writing; has finished   wrote; finished   wrote; has finished   had written; has finished  
was writing    wrote    has written    had written  
has written  was writing  wrote  had written  
sold   to sell   have sold   selling  
has written  was writing  wrote  had written  

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