求教英语问题A survey of teachers of Advanced Placement courses in American high schools has found that more than half are concerned that the program's effectiveness is being threatened as districts loosen restrictions on who can take AP courses

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求教英语问题A survey of teachers of Advanced Placement courses in American high schools has found that more than half are concerned that the program's effectiveness is being threatened as districts loosen restrictions on who can take AP courses
求教英语问题
A survey of teachers of Advanced Placement courses in American high schools has found that more than half are concerned that the program's effectiveness is being threatened as districts loosen restrictions on who can take AP courses and as students flock to them to polish their resumes.
1后半段部分的...loosen restrictions on who...
on 是和前面哪个词搭配的?
2末尾处flock to them to 为什么要这样用?

求教英语问题A survey of teachers of Advanced Placement courses in American high schools has found that more than half are concerned that the program's effectiveness is being threatened as districts loosen restrictions on who can take AP courses
给你分析一下句子结构吧：
as districts loosen restrictions on who can take AP courses
and as students flock to them to polish their resumes.
这两部分是并列关系,用and连接,这里as...相当于when,当什么什么时候
当多地区放松对参加AP课程的限制并且学生们向他们(老师们)蜂拥而至来为自己的简历镀金的时候,这里flock to them to do 就是蜂拥而至做什么什么事情的意思,flock这个词用的很形象.
两个as后面的部分都是从句部分了,实际句子的主干在前面.on 当然是和lossen搭配,loosen on
放松了什么什么政策或东西

求教英语问题A survey of teachers of Advanced Placement courses in American high schools has found that more than half are concerned that the program's effectiveness is being threatened as districts loosen restrictions on who can take AP courses the results of a survey是什么意思 怎样用do a survey of造句 a survey of your friends how do they spend their lucky money?的英语作文 英语问题求教 做一个关于...的调查用英语怎么说书上写的是do a survey of可我记得是do a survey about a survey of a survey of修饰主语谓语动词用单数还是复数并举例说明, do a survey for与do a survey of 有什么区别 do a survey on和do a survey of有什么区别 do a survey for与do a survey of 有什么区别?急!~~ do a survey of和do a survey for的区别,最好有例句. 什么时候用do a survey of什么时候用do a survey to 英语介词后面可以跟句子吗?They did a survey of how the students get to school. 初二英语同步：作文开头：We did a survey of our readers and this is what we ____ We did a survey of what movies studentslike watching.翻译 【改错】:We made a survey of all the students. Did a survey 是for 、about还是of 《A Survey of English Literature》 是谁写的