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
2-this an idiomatic construction: nor + helping verb + subject.
CONJ You use nor after a negative statement in order to introduce another negative statement which adds information to the previous one. (用于否定句后，引出另一否定句以补充前句) 也不
e.g.
Cooking up a quick dish doesn't mean you have to sacrifice flavor. Nor does fast food have to be junk food
E。 The GMAT requires the use of the serial comma (aka the Oxford comma) for every item in a list, including the last item in a list of 3+ items.
But even more fundamentally, insert “permeating” as an -ing modifier right after the comma, which opens up a confusing ambiguous reference because “permeating” could mean that:
groundwater permeates the bone
the action of groundwater permeates the bone
or even the fossilization through the action of groundwater permeates the bone
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考察谓语动词单复数，appear表示的是恐龙出现，用appears。
错选e，from修饰的是found。。from。。