Sketch of a biblatex solution:

\usepackage[autocite=footnote,style=verbose-trad1]{biblatex}
\let\cite\autocite


Now when you write Something something\cite{key} the citation will be placed in a footnote at the bottom of the page

Superscript citations without brackets with the `revtex4-1` document class
I am just practising some english grammar related questions , here is the question I am confused about :


  Salman finished__________ two of his published compositions before his twelfth birthday.
      A. Written
      B. Writing
      C. To write
      D. Wrote  


Its correct answer is B. Writing. But why should we select "writing", what's the logic or rule behind it?
