1.The correct answer is A

　　The error in this sentence occurs at (A), where there is inappropriate word choice. In this context, “Except for” doesn't make sense. Instead, “Without” is needed.

　　2.The correct answer is A

　　The error in this sentence occurs at (A), where there is awkward and wordy phrasing. The awkward “Long been” should simply be “Long” (“Long isolated...”).

　　3.The correct answer is B

　　The error in this sentence occurs at (B), where there is subject-verb disagreement. The singular verb “is” is needed to agree with the singular noun “the number.”

　　4.The correct answer is C

　　The error in this sentence occurs at C. The plural verb “have” does not agree with the singular subject “writer” and should be replaced with the singular verb “has.”

　　5.The correct answer is C

　　The error in this sentence occurs at (C), where there is subject-verb disagreement. The plural verb “make” does not agree with its singular subject, “An abundant supply.”

　　以上就是这5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，可以用来做日常的练习。