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____________ the situation, Charles Yerkes undertook ____________ the system in 1902 by obtaining ownership of many different lines.
A.Seeing, improvingB.Seen , improved
C.To see, to improveD.Having seen, improving
D

试题分析:考察分词作状语和固定搭配。第一空的动词see与句子主语Charles Yerkes构成主动关系,说明使用现在分词,因为这是已经发生的事情,故使用完成式。第二空是固定词组undertake doing sth承诺做某事。故D正确。
点评:固定搭配是学习语言的重要环节。要掌握好英语,记忆相当数量的词组是必不可少的。英语中的每一个词组,不仅表达一定的概念,具有一定的词汇意义,而且在语音、拼法、语法等方面都有自己的特点。在学生学习英语的过程中,单词、词组记忆是基础。解答这类题目,关键是理解题干意思以及各选项词组的意思,可以像数学中的代入法一样,依次把各个选项意思放入句子中进行比较,不难选出正确答案。当分词做状语的时候,如果构成分词的动词与句子的主语构成主动关系,就使用现在分词做状语;当二者构成被动关系,使用过去分词做状语。如果分词的动作发生在谓语动词之前,就使用分词的完成式。如果分词与句子的主语没有关系,可以使用状语从句或者独立主格结构。
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