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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
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这个感觉a也对啊，enough to do？？
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。
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