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The maths problem remained confusing to the boy although _______ over and over.

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it    that    which    what  
it  that  that is  it is  
it    this    that    him  
it    this    that    that’s  
when to work    who to work    what to work    how to work  
what    that    which    it  
explained    explain    explaining    having explained  
look for    go for    go with    go to for  
In, problem    By, problem    In, question    By, question  
worked on    worked for    worked as    worked out  
it    this    that    that’s  
explaining   being explained   explained   having explained  
What      How   Why     Which  
an hard    an easy    a easy    hard  
such a difficult problem that    so a difficult problem as    so difficult a problem that    as difficult a problem as  
help    bring    make    Get  
still  yet  although  though  

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