In arguing that this decline of feudalism was economically determined, the Marxist asserted that the Black Death was a relatively insignificant factor. 其实还是文章理解不到位；
many schools do not have, or are likely to have=many schools do not have, or many schools are likely to have，that's why not后面跟nor不跟or
nor和or/and一样是连词，that's why D选项后面跟了主语they，有两个独立的句子还是对的，因为nor是连词，且是并列连词！！
FANBOYS：for, and, nor, but, or, yet, so
默念：遇到FANBOYS for and nor but or yet so 的句子，拆开独立的看～ not不要遗漏。
头大，第二次还是错，对A最大的疑问是more than all the North American Great Lakes combined到底是什么成分；
Ron说“more than all the North American Great Lakes combined”作定语修饰“20 percent of the world's fresh water”，整个应该放到which的定语从句里面作为次级修饰语，和“holds … water“一起修饰贝尔加湖；看着还行，因为如果省略了中间的“which holds 20 percent of the world's fresh water”， “more than 五大湖”直接接到“贝尔加湖”后面就毫无意义了。
后面省略了动词do, 如果是👇这样应该就清楚了很多：
Siberia's Lake Baikal, which holds 20 percent of the world's fresh water more than （DO） all the North American Great Lakes combined=>贝加尔湖，它拥有世界上20%的淡水，比北美五大湖（拥有）的总和还要多
as身后直接为“in the most other developed countries”这一状语，说明省略了主句部分，但前面的主句部分直接copy过来就成了“Linking arrangements between secondary schools and the workplace never evolved in the most other developed countries”。其字面意思为“学校和工作的联系在其他发达国家也从未发展”。但合理的意思应该是在美国没发展，但在别的国家发展了。
“continue to do” means “start doing something again that was previously interrupted”, whereas “continue doing” means “to carry on the same thing you have already been doing”.
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which修饰就近名词，不能是药物occur只能是现象，排除de。