参考答案及解析：

　　1.The correct answer is E

　　Explanation

　　Choice (E) is correct. It avoids the wordiness of the original by deleting the unnecessary phrase “what was,” resulting in the concise “English was spoken.”

　　2.The correct answer is D

　　Explanation

　　Choice (D) is correct. It avoids the error of the original by using the preposition “As” to indicate what the “steps toward … integration” were a part of.

　　3.The correct answer is C

　　Explanation

　　Choice (C) is correct. It avoids the verb tense error of the original. The past tense verb “remained” is not consistent with the present perfect tense verb “have made” and should be changed to the present tense verb “remain.”

　　4.The correct answer is D

　　Explanation

　　Choice (D) is correct. It avoids the awkwardness of the original by using the idiomatic “as … as” construction to compare “Africa” with “Asia.”

　　以上就是这4道SAT语法改进句子练习题的全部内容，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。