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They went on working ______ it was late at night.

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but  so  and  or  
Working    Working at    Working on    Work on  
but  so  and  or  
Even though; but   If; /    Though; but    Though; /  
have been working    was working    have worked    worked  
even if    as if    however    as though
  
If    Whether    But    Though  
worked  was working  had worked  is working  
A. worked    would work    would be working    has been working  
working; went; heard    work; to go;    working; go; hearing    working; going; heard  
worked, got through    working, went through    was working, experienced    has worked, experienced  
working; went; heard    work; to go; hear    working; go; hearing    working; going; heard  
went; heard    going; heard    went; hear    going; hear  
have    has    to have    having  
Although, but    but, /    Although, /    /, though  
Though   Because   Since   Whether  
As it was late    Late as it was    Like it was late    Like it was late  
they    and they    but they    it  
although    even if    however    whatever  
have been working   was working   have worked   worked