A study found that the environmental costs of producing and recycling paper cups were as high as, if not higher than, to produce

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问题 A study found that the environmental costs of producing and recycling paper cups were as high as, if not higher than, to produce and recycle polystyrene cups.

选项 A、those of producing and recycling
B、that of producing and recycling
C、which produced and recycled
D、that produced and recycled

答案A

解析 本题中比较结构为as high as,被比较对象costs为复数名词,因此比较对象应一致,A项正确。
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