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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）。
虽然知道C选项最好， 找不到A选项的错误哎。
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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