UPDATE 6-Oil at highest since March on lower U.S. inventories, recovering demand
* U.S. crude inventories drop by 5 million barrels* OPEC says market responding well to record supply cut* Brent, U.S. crude hit highest since March 11 (Updates prices)By Alex LawlerLONDON, May 21 (Reuters) - Oil prices rose on Thursday to their hi...
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