◎ 题干
Compared with 2 million tons last year,   our coal output has increased ________ three times;
that is to say,   our coal output has increased ________ 8 million tons this year.
[      ]
A. to; to    
B. to; by  
C. by; by    
D. by; to
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◎ 解析
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◎ 知识点
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