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题库 / Prep2007E1-SC-89
Methane, which has long been counted among the greenhouse gases that are implicated in global warming, comes both from natural sources such as bogs and from a host of human sources, including coal mines, leaking pipelines, landfills, and rice paddies.
that are implicated in global warming, comes both from
that are implicated in global warming, coming from both
being implicated in global warming, comes from both
implicated in global warming and coming both from
implicated in global warming, that come both from
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考点: 句子结构(Grammatical Construction) 平行对称(Parallelism)
1) 一个正确的句子中,主语和谓语是必不可少的,缺少主语和谓语都会导致句子结构不完整
2) both…and…结构必须要平行
(A) 正确, that从句修饰greenhouse gases, which从句修饰Methane, comes both from… and from作为整个句子的谓语成分,且符合平行
(B) 整个句子缺乏谓语; from both…and from…结构不平行
(C) being多余; from both…and from…结构不平行
(D) 句子结构变为:Methane, which… 整个句子结构缺乏谓语
(E) 句子结构变为:Methane, which…, that come… 整个句子结构缺乏谓语
句子结构: Methane, which…, comes both from…and from…
分析的完美，顶晶晶！！！
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BDE、coming/ that come导致无谓语，句子成分残缺；且 that come限制性定语从句不能逗号隔开
需要与未划线and from 平行，杀BC
D: 定语从句看到分词形式要把定从删掉看看句子是否完整。
考察平行结构和句子成分。