By John Tilak TORONTO (Reuters) - Canada's main stock index advanced on Wednesday, led by gains in the natural resource sectors, as investors mulled budget talks in Washington and when the U.S. Federal Reserve's monetary policy might change. BlackBerry shares gave back nearly 3 percent as skepticism grew about the financing of a takeover deal it announced earlier this week. Investors also digested data showing orders for long-lasting U.S. ...



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