SAT语法：SAT考试中的PK原则解析

掌握SAT语法考点，是大家在备考SAT考试时最重要的一个项目。SAT语法的IS题，不仅考察句子的正确性，还会考察句子表达的好坏，好坏的标准有两个，一个是clear,一个是precise。我们将对语法没有错误的选项进行好坏对比的原则成为PK原则。

　　关于clear：
　　Countries included in this varied and interesting study of economic theory was the United Kingdom, Germany, Sweden, and France.
　　(A). Countries included in this varied and interesting study of economic theory was
　　(B). Countries included in this varied and interesting study of economic theory were
　　(C). Countries being included in this varied and interesting study of economic theory was
　　(D). Varied and interesting, this study of economic theory included countries that were
　　(E). In this varied and interesting study of economic theory, such countries included as
　　上题中，B与D选项是没有语法错误的，但是D选项里countries that were 完全可以去掉，加入的话会使句子啰嗦重复，违背了clear的原则，所以选B。

　　关于precise:
　　Our team has worked for several months on a robot for the science fair that we plan on entering in the robotics division.
　　(A). months on a robot for the science fair that we plan on entering in the robotics division
　　(B). months on a robot that we plan to enter in the robotics division of the science fair
　　(C). months on a robot that we planned entering in the science fair, robotics division
　　(D). months, we plan to enter a robot for the science fair in the robotics division
　　(E). months, we are planning to enter a robot in the robotics division of the science fair
　　上题中，A选项与B选项是正确的，但是A选项中，that后的定语成分与所要修饰的名词robot之间隔了一个短语，即for the science fair，可能会引起修饰fair的歧义，指代不够准确，因此选B。

　　特殊比较：Because比because of, in that, owe to等等要好
　　At lunchtime, Kevin paid for Anita's hamburger; the reason is because he owed her money.
　　(A). hamburger; the reason is because he owed
　　(B). hamburger; this was because he owed
　　(C). hamburger, in that he owed
　　(D). hamburger because he owed
　　(E). hamburger because of owing

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