我认为有两种方法可以做到这一点，两者都非常相似。

A） 您可以收集数组中显示的帖子的ID，然后排除具有post__not_in 类似这样的查询参数：

$years_loop = get_terms(
    array(
        \'taxonomy\'  => \'works_year\',
        \'orderby\'   => \'slug\',
        \'order\'     => \'DESC\',
        )
);

// array for displayed posts, we will update it with every loop
$displayed = [];

foreach($years_loop as $year_loop_slug) :
    $args = array(
        \'post_type\'       => \'works\',
        \'posts_per_page\'  => -1,
        \'post__not_in\'    => array_unique( $displayed ),
        \'tax_query\'       => array(
            array(
                \'taxonomy\'  => \'works_year\',
                \'field\'     => \'slug\',
                \'terms\'     => array( $year_loop_slug->slug ),
                \'operator\'  => \'IN\',
            )
        ),
    );
    $loop = new WP_Query($args);
    while ($loop->have_posts()) : $loop->the_post();

        // update array with currently displayed post ID
        $displayed[] = get_the_ID();

        //your output

    endwhile;
endforeach;

$years_loop = get_terms(
    array(
        \'taxonomy\'  => \'works_year\',
        \'orderby\'   => \'slug\',
        \'order\'     => \'DESC\',
        )
);

// array for displayed posts, we will update it with every loop
$displayed = [];

foreach($years_loop as $year_loop_slug) :
    $args = array(
        \'post_type\'       => \'works\',
        \'posts_per_page\'  => -1,
        \'tax_query\'       => array(
            array(
                \'taxonomy\'  => \'works_year\',
                \'field\'     => \'slug\',
                \'terms\'     => array( $year_loop_slug->slug ),
                \'operator\'  => \'IN\',
            )
        ),
    );

    $loop = new WP_Query($args);
    while ($loop->have_posts()) : $loop->the_post();
        // if the current post was already displayed, move on to the next iteration of this loop
        if ( in_array( get_the_ID(), $displayed ) ){
            continue;
        }
        // update array with currently displayed post ID
        $displayed[] = get_the_ID();

        //your output

    endwhile;
endforeach;