Domestic automobile manufacturers have invested millions of dollars into research to develop cars more gasoline-efficient even than presently on the road.
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Ainto research to develop cars more gasoline-efficient even than presently on the road
分析该选项
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Binto research for developing even more gasoline-efficient cars on the road than at present
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Cfor research for cars to be developed that are more gasoline-efficient even than presently the road
分析该选项
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DIn research to develop cars even more gasoline-efficient than those at present on the road
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Ein research for developing cars that are even more gasoline-efficient than presently on the road
分析该选项
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正确答案: D