Cum afișez câte 3 postări într-un carusel Bootstrap?

Următorul cod afișează 3 postări pe un rând în clasa item active.. dar cum pot afișa alte postări din tipul custom de postări în clasa item, astfel încât caruselul să deruleze pentru a afișa alte grupuri de câte 3 postări pe rând, ca în imaginea de mai sus..

<?php
$args = array( 'post_type' => 'testimonial','numberposts' => 3 );
$lastposts = get_posts( $args );
$index = 0;?>

<div class="carousel-reviews broun-block">
<div class="container">
<div id="carousel-reviews" class="carousel slide testi" data-ride="carousel">
<div class="carousel-inner">
<div class="item active">
<?php foreach($lastposts as $post) : setup_postdata($post); ++$index; ?>
            <div class="col-md-4 col-sm-6">
                <div class="block-text rel zmin">
                    <p><?php the_content();?></p>
                    <ins class="ab zmin sprite block"></ins>
                </div>
                <div class="person-text rel">
                    <a title="" href="#"><?php the_title();?></a>
                    <i><?php the_field('country');?></i>
                </div>
            </div>
<?php endforeach; ?>
            </div>

Folosind while

<?php
$args = array('post_type' => 'testimonial',
    'posts_per_page' =>-1,
    'caller_get_posts'=> 3,
);
$the_query = new WP_Query($args);?>
<?php if ( $the_query->have_posts() ):?>
<?php  $j = 0; ?>
<div class="carousel-reviews broun-block">
<div class="container">
<div id="carousel-reviews" class="carousel slide testi" data-ride="carousel">

<div class="carousel-inner">
<?php while ($the_query->have_posts()):$the_query->the_post();?>
<?php if($j  == 0): ?>
<div class="item active">
            <div class="col-md-4 col-sm-6">
                <div class="block-text rel zmin">
                    <p><?php the_content();?></p>
                    <ins class="ab zmin sprite block"></ins>
                </div>
                <div class="person-text rel">
                    <a title="" href="#"><?php the_title();?></a>
                    <i><?php the_field('country');?></i>
                </div>
            </div>
        </div>
    <?php else: ?>
        <div class="item ">
            <div class="col-md-4 col-sm-6">
                <div class="block-text rel zmin">
                    <p><?php the_content();?>
                        <ins class="ab zmin sprite block"></ins>
                </div>
                <div class="person-text rel">
                    <a title="" href="#"><?php the_title();?></a>
                    <i><?php the_field('country');?></i>
                </div>
            </div>
        </div>
    <?php endif; ?>
    <?php $j++; ?>
<?php endwhile; endif; ?>
</div>
<a class="left carousel-control" href="#carousel-reviews" role="button" data-slide="prev">
    <span class="fa fa-arrow-circle-left"></span>
</a>
<a class="right carousel-control" href="#carousel-reviews" role="button" data-slide="next">
    <span class="fa fa-arrow-circle-right"></span>
</a>
</div>


</div>
</div>