NEW YORK (Reuters) - U.S. commercial crude supplies shot to the highest level in nearly seven years last week on sluggish refinery use and high imports, the government said on Wednesday. U.S. oil stocks jumped 6.8 million barrels in the week ended March 3 to 335.1 million barrels, or 10 percent higher than last year, according to the Energy Information Administration (EIA), the statistical arm of the Department of Energy. "The crude build is huge," said Jason Schenker, an economist at Wachovia Bank in Charlotte, North Carolina. Oil futures on the New York Mercantile Exchange fell more than $1.00 after...