参考答案及解析：

　　1.The correct answer is C

　　Explanation

　　The correct choice is (C). It avoids the subject-verb disagreement of the original by replacing the plural verb "have" with the singular verb "has" to agree with the singular subject, "The Sundance Film Festival."

　　2.The correct answer is A

　　Explanation

　　The error in this sentence occurs at (A), where there is an improper idiom. The phrase “in addition to” is needed in place of “also.”

　　3.The correct answer is B

　　Explanation

　　The correct choice is (B). The singular possessive pronoun "its" does not agree with the plural noun it refers to, "Scientists," and should be replaced with the plural possessive pronoun "their."

　　4.The correct answer is A

　　Explanation

　　The error in this sentence occurs at (A), where there is an inappropriate idiom. The idiom is “Between x and y,” not “Between x to y.”

　　5.The correct answer is D

　　Explanation

　　The error in this sentence occurs at (D), where there is an inappropriate verb form. The infinitive “to achieve” is needed to parallel the infinitive “to use.”

　　6.The correct answer is B

　　Explanation

　　The error in this sentence occurs at B. The relative pronoun “that” may not be used to refer to people (“individuals”) and should be replaced with the relative pronoun “who.”

　　以上就是这6道SAT语法句子改错练习题的全部内容，非常详细，后面附有详细的答案解析。大家在备考自己的SAT语法考试的时候，可以加强练习相关题目。