TORONTO, Aug 7 (Reuters) - Canada's main stock index dropped on Thursday, dragged by declines in most major sectors, as worries about the crisis in Ukraine escalated. The Toronto Stock Exchange's S&P/TSX composite index unofficially closed down 83.32 points, or 0.55 percent, at 15,118.77. Eight of the 10 main sectors on the index were in the red. (Reporting by John Tilak; Editing by James Dalgleish)
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