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题库 / Prep2007E2-SC-56
Unlike crested wheatgrass, an alien species from Siberia that forms only shallow roots and produces tall above-ground shoots, native North American grasses develop an extensive root system, allowing for greater enrichment of the soil, but do not grow to be very tall.
native North American grasses develop an extensive root system, allowing for greater enrichment of the soil, but do not grow to be very
native North American grasses develop an extensive root system, which allows for their greater enrichment of the soil, but without growing to be that
the root system of native North American grasses is extensive, allowing for greater enrichment of the soil, but they do not grow to be very
the root system of native North American grasses is more extensive, allowing for the greater enrichment of the soil, but these grasses do not grow to be very
the extensiveness of the root system of native North American grasses allows for their greater enrichment of the soil, but they do not grow to be that
根据句首的unlike crested wheatgrass，答案剩下 choice a,b
choice a, develop & grow 是两个独立的谓语动词并列。“长出根系” 和“长得多高” 是两个没有关联的动作
choice b, but without growing to be that tall其实是一个省略后的结构，还原：but (grasses develop an extensive root system )without growing to be that tall. 这里growing作为状语修饰develop
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