我相信最简单的方法是使用javascript。它将在每个评论列表中导航并只显示最后一个按钮。类似于：

jQuery(document).ready( function($){

    //Hide all buttons
    $(\'.comments li .reply-button\').hide(0);

    //Navigate through all comments
    $(\'.comments li\').each( function() {

        //Lets check if there is children comments in this one
        if (! ($(this).children(\'.children\').length > 0)) {

            //Don\'t have, so let\'s show this button
            $(this).find(\'.reply-button\').show(0);
        }

    })
})