I’m afraid that this doesn’t have much in common with WP, but…
One of the way to solve this would be to put iframe on page B and set its source to site A. So in site B you do something like this:
<html>
....
<body>
<iframe src="http://dominoA.com/landing-page" style="position: fixed; top: 0px; left: 0px; bottom: 0px; right: 0px; width: 100%; height: 100%; border: none; margin: 0; padding: 0;">
Your browser doesn't support iframes
</iframe>
</body>
</html>
You could also use CNAME record, I guess…
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