题目内容
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 |
D
略
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| A.to; to | B.to; by | C.by; by | D.by; to |