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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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D. 并不在于接两个完整句子，and 后面有thereby，所以可以是一个subject， 但是因此就有问题，引用官方解析如下：
“As in choice A, this choice suggests that the graders themselves might waste rainwater.”
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