Checking for two categories in query_posts

Don’t use query_posts. Use WP_Query, and use it’s tax_query.

$query = new WP_Query( array(
    ...
    'tax_query' => array(
        array(
            'taxonomy' => 'category',
            'field' => 'slug',
            'terms' => array( 'recent-work', 'plumbing', 'cat3' )
        )
    ),
    'posts_per_page' => 1
    ...
);

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