Who is the stockholder of the road tunnels operated by the Massachusetts Department of Transportation?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/operator> <http://dbpedia.org/resource/Massachusetts_Department_of_Transportation> . ?x <http://dbpedia.org/property/owner> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/RoadTunnel>}
Massachusetts_Department_of_Transportation