E：until healing歧义，作为状语修饰谓语，而谓语的发起者是主语，healing的主语变成了 widespread swelling and stiffness，但从逻辑上heal的主语应该是injured area ；until和as一样，做介词或连词，介词后面加名词 比如 until 1994
，连词后面加句子 until it has healed；句首的unlike已经表示两者的比较了，instead是赘余的。
所以选了until it has healed
instead 赘余
immobilize 使固定不动
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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E：until healing歧义，作为状语修饰谓语，而谓语的发起者是主语，healing的主语变成了 widespread swelling and stiffness，但从逻辑上heal的主语应该是injured area ；until和as一样，做介词或连词，介词后面加名词 比如 until 1994，连词后面加句子 until it has healed；句首的unlike已经表示两者的比较了，instead是赘余的。
所以选了until it has healed
instead 赘余
immobilize 使固定不动