Sophisticated laser-guided land graders can now flatten uneven farmland almost perfectly so as not to waste rainwater in runoff down sloping fields.
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Aso as not to waste rainwater
分析该选项
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Bso that rainwater is not wasted
分析该选项
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Cso that there is no wasted rainwater
分析该选项
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Dand thereby not waste rainwater
分析该选项
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Eand there is no rainwater wasted
分析该选项
显示答案
正确答案: B