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题库 / OG2018-SC-751
About 5 million acres in the United States have been invaded by leafy spurge, a herbaceous plant from Eurasia with milky sap that gives mouth sores to cattle, displacing grasses and other cattle food and rendering rangeland worthless.
States have been invaded by leafy spurge, a herbaceous plant from Eurasia with milky sap that gives mouth sores to cattle, displacing grasses and other cattle food and rendering
States have been invaded by leafy spurge, a herbaceous plant from Eurasia, with milky sap, that gives mouth sores to cattle and displaces grasses and other cattle food, rendering
States have been invaded by leafy spurge, a herbaceous plant from Eurasia having milky sap that gives mouth sores to cattle and displacing grasses and other cattle food, rendering
States, having been invaded by leafy spurge, a herbaceous plant from Eurasia with milky sap that gives mouth sores to cattle, displaces grasses and other cattle food, and renders
States, having been invaded by leafy spurge, a herbaceous plant from Eurasia that has milky sap giving mouth sores to cattle and displacing grasses and other cattle food, rendering
题目分析：
本题长度较长，但难度不算大。大概意思为：
有很多美国的土地被乳浆草侵占了。乳浆草是一个从Eurasia来的草本植物。这个草本植物让小牛长了口腔溃疡并且代替了草和其它的小牛食物，让牧场一文不值。
选项分析：
A选项：划线部分最后的分词短语displacing grasses and other cattle food是a herbaceous plant gives mouth sores to cattle的伴随状语。但在逻辑上，由于“长口腔溃疡”和“代替草和其它的小牛食物”是乳浆草的两个方面事情，之间没有逻辑关系，因此，两者应该用并列句来表示，不能让一者为另一者的伴随状语（若是伴随状语，则两者变为了修饰关系）。
另外，displace句和render句之间应用修饰关系而不是并列关系。这是因为，代替了草和其它的小牛食物的结果是“让牧场一文不值（render rangeland worthless）”。
B选项：Correct. 本选项在语法和逻辑上均是正确的。
C选项：按照本选项的语法结构，having milky sap that gives mouth sores to cattle和displacing grasses and other cattle food是并列关系，但在逻辑上，两者不能并列。拥有 milky sap是这个草本植物的固有属性（无论这个草在哪里），而“代替草和其它的小牛食物”是这个草本植物入侵美国后的结果。
D选项：本选项缺少谓语动词。选项末的displaces和renders均为单数动词，不可能作为复数名词about 5 million acres in the United States的谓语动词。
E选项：本选项缺少谓语动词。
在B里，that从句是修饰到草的，因为that只能用于限定性修饰，如果修饰sap的话不能加逗号。以及，gmat里定语可以跳过介宾短语优先修饰前面的名词。
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