a fence
... that Pakistan has been trying to put up a fence on its border with Afghanistan since 2005?
... that Pakistan has been trying to put up <b id="mwvA"><a class="mw-redirect" href="./Pakistan–Afghanistan_barrier" id="mwvQ" rel="mw:WikiLink" title="Pakistan–Afghanistan barrier">a fence</a></b> on its border with Afghanistan since 2005?