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题库 / GMATAdvanced-SC-33
Sophisticated laser-guided land graders can now flatten uneven farmland almost perfectly so as not to waste rainwater in runoff down sloping fields.
so as not to waste rainwater
so that rainwater is not wasted
so that there is no wasted rainwater
and thereby not waste rainwater
and there is no rainwater wasted
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graders can flatten farmland so as not to waste rainwater -- graders waste rainwater--- doesn't make sense
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