U.S. stocks opened higher on Wednesday, tracking a rally in oil prices and solid gains by European equities one day ahead of the closely watched European Central Bank meeting. The S&P 500 opened 6 points, or 0.3%, higher at 1,986. The Dow Jones Industrial Average gained 58 points, or 0.4%, to 17,028 at the open. Meanwhile, the Nasdaq Composite began the day up 19 points, or 0.4%, at 4,666.
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