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Since 1978, when China began opening its economy to increased foreign investment and trade, aggregate output has more than doubled.()

Since 1978, when China began opening its economy to increased foreign investment and trade, aggregate output has more than doubled.()
A、自从1978年中国经济向日益增加的外国投资和贸易敞开大门以来,总产量增加了两倍以上。
B、自从1978年以来,中国经济为日益增加的外国投资和贸易敞开大门,总产量增加了一倍以上。
C、自从1978年以来,中国经济为日益增加的外国投资和贸易敞开大门,总产量增加了一半以上。
D、自从1978年以来,中国经济为日益增加的外国投资和贸易敞开大门,总产量翻了两番以上。
正确答案:B