Minimally, I have the following code:
\documentclass[8pt]{article}
\usepackage{tikz-qtree}
\usepackage{tikz-qtree-compat}
\begin{document}
\ex.
\begin{tikzpicture}[baseline]
\Tree[.CP Op$_c$ [.C' [.C is ] [.TopP \qroof{this task}.NP [.Top
[.Top is ] [.TP \qroof{\textit{pro}}.NP [.T' [.T ] \qroof{this task}.vP ] ] ]
] ] ]
\end{tikzpicture}
\end{document}
I want to draw a single-line strikethrough line on the word 'is' in C node. I tried adding \st{is} to the relevant node in order to create the strikethrough, but the tree wouldn't print. Any ideas how to do the strikethrough? Thank you very much!