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题库 / Prep2007E1-SC-94
The decline of the mountain yellow-legged frog in the high reaches of the Sierra Nevada has become severe enough for the United States Fish and Wildlife Service quite possibly to list it as an endangered species in the near future.
severe enough for the United States Fish and Wildlife Service quite possibly to list it
severe enough so that the United States Fish and Wildlife Service could well list them
severe enough for it quite possibly to be listed by the United States Fish and Wildlife Service
so severe that the United States Fish and Wildlife Service could well list it
so severe that they could well be listed by the United States Fish and Wildlife Service
还没有题目讲解（毕出老师会陆续发布对官方考题的解读，请保持关注）。
数量下降如此严重，以至于科学家把它列入濒危名单
想用复数来指代整个青蛙种群，但是全句没有复数名词而且frog前面加了the，还是用it吧
AC、redundancy
enough to不好，不能指“以至于”
paired with "quite possibly", this creates a contradiction. Eliminate A and C.
未划线部分as an endangered species可排除B（them）
如此严重以至于……
enough 指已经足够了
quite possible 指很有可能
重复了！！！！而且enough 与possible 有点矛盾
paired with "quite possibly", this creates a contradiction.
E中的they与the mountain yellow-legged frog的数不一致，排除。
A和C中的for作状语，修饰become。
BD应该是it，排除。
paired with "quite possibly", this creates a contradiction.
并不是主动优于被动，而是E选项They无指代，应该用it登录 或 注册 后可以参加讨论
paired with "quite possibly", this creates a contradiction.
paired with "quite possibly", this creates a contradiction.
enough to do本身没错，但是在这道题目中不对。因为，这道题目的意思是，下降非常严重，如此以至于可以被列入濒危动物了。下降非常严重并不会直接导致被列入濒危动物，只是说，下降的严重，如此以至于达到了被列入的标准。登录 或 注册 后可以参加讨论
enough身后的是for sb. to do sth.，这是不定式短语，答案选项D是结果状语从句，考了不定式和从句的区别。
可是不是应该用不定式吗？become约束力不强吗？
不定式表示的是一种“主观性”，即，表达一种状态的转换（start-stop）。从句表示的是一种“客观性”，即，表达一种状态的稳定（process）。
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