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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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"enough for xxx to happen" is a threshold. this is going to be some EXACT boundary at which something starts to happen.
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……
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