\documentclass{article}
\usepackage{pdfpages}%直接插入pdf文件页
\graphicspath{{egfigure/}{example/}}

\begin{document}

\includepdf[pages=-]{egfigure/tgbcitation.pdf}

\IfFileExists{egfigure/tngbcitationay.pdf}
{\includepdf[pages=-]{egfigure/tngbcitationay.pdf}}
{\includepdf[pages=-]{egfigure/tngbcitationaynew.pdf}}

\includepdf[pages=-]{egfigure/tgbbiblio.pdf}

\end{document}