The production of these biofuels, such as ethanol made from maize, has risen sharply recently,　（） th

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The production of these biofuels, such as ethanol made from maize, has risen sharply recently,　（） the replacement of food crops with fuel crops has been heavily criticized.

A.but

B.and

C.when

D.or

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答案：but

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The production of these biofuels, such as ethanol made from maize, has risen sharply recently,　（） th

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The production of these biofuels, such as ethanol made from maize, has risen sharply recently,　（） th