General Motors Co Chief Executive Mary Barra will not come before  Canadian legislators to answer questions about the automaker's future in  the country, but lower-ranking executives will appear, a lawmaker said.  GM said in November it would close its Oshawa, Ontario, assembly plant  by year-end, part of a broad restructuring affecting four other plants  in the United States, as it cuts costs and invests in electric and  self-driving vehicles. 
 
 Last month, the Canadian Parliament's Standing Committee on Industry,  Science and Technology approved Vice Chairman Brian Masse's request for  Barra to "explain GM's future and continued commitment to the Canadian  automotive and manufacturing industry."
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