英语语法问题！复杂句

Question

while language management was generally left to the states ,whose policies reflected national beliefs, starting in1962, the widespread implementation of Title VI of the Civil Rights act, providing access to federally provided and funded services for persons with limited English proficiency, bolstered for a while by the Bilingual Education Act and theoretically continued in English Language Learner progams of recent educational law,（had/have /has been working, are working）to dedend the language rights of those in the United states who do not speak English. 求解整句话的具体结构，即主谓宾，希望要清晰明了。还有括号内有四个选项，个人觉得是has been working ，不知道是否正确。

Answer 1

是的，正确选项是has been working
（原文来自Bernard Spolsky(2005)的一篇论文“Language Policy”）

句子结构：
状语从句【While language management was generally left to states, whose policies reflected national beliefs,】
状语【starting in 1962,】
主语【the widespread implementation of Title VII of the Civil Rights Act,】
定语（修饰Title VII）【providing access to federally provided and funded services for persons with limited English proficiency, bolstered for a while by the Bilingual Education Act and theoretically continued in the English Language Learner programs of recent educational law,】
谓语【has been working】
状语【to defend the language rights of those in the United States who do not speak English.】

这个长句的意思：
虽然语言管理原先通常由各州作主（各州政策反映民意），但是1962年实施的“民权法案”第7章规定，要为英语水平有限的人提供联邦政府组织和资助的种种服务。有关规定曾经一度得到“双语教育法案”的促进，而且在理论上，还在最近的教育法规定的“英语学习课程”中继续推行。该规定的广泛实施，一直致力于保护那些身在美国却不会说英语的人的语言权利。追问

为什么用现在完成进行时而不是过去完成进行时呢？

追答

自从1962年至今，这个法案一直在保护人们的语言权利，所以用现在完成进行时。