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Montreal became a major port in Canada because it is___________.
A、next to Ottawa
B、next to the city of Quebec
C、in the province of Quebec
D、on an island in the St. Lawrence River
【正确答案】：D
【题目解析】：蒙特利尔位于圣劳伦斯河的岛屿上，使其成为一个非常重要的港口。